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145-680: Jade is well known for its ornamental use in East Asian , South Asian , and Southeast Asian art . It is commonly used in Latin America , such as Mexico and Guatemala . The use of jade in Mesoamerica for symbolic and ideological ritual was influenced by its rarity and value among pre-Columbian Mesoamerican cultures , such as the Olmecs , the Maya , and other ancient civilizations of

290-491: A Christie's auction. In May 2009, a 7.03-carat (1.406 g) blue diamond fetched the highest price per carat ever paid for a diamond when it was sold at auction for 10.5 million Swiss francs (6.97 million euros, or US$ 9.5 million at the time). That record was, however, beaten the same year: a 5-carat (1.0 g) vivid pink diamond was sold for US$ 10.8 million in Hong Kong on December 1, 2009. Clarity

435-573: A European one. Its hegemony was the heart of an empire that would include Taiwan and Korea . During World War II, Japanese expansionism with its imperialist aspirations through the Greater East Asia Co-Prosperity Sphere would incorporate Korea, Taiwan, much of eastern China and Manchuria, Hong Kong, and Southeast Asia under its control establishing itself as a maritime colonial power in East Asia. After

580-511: A century of exploitation by the European and Japanese colonialists, post-colonial East Asia saw the defeat and occupation of Japan by the victorious Allies as well as the division of China and Korea during the Cold War . The Korean peninsula became independent but then it was divided into two rival states , while Taiwan became the main territory of de facto state Republic of China after

725-453: A cigarette lighter, but house fires and blow torches are hot enough. Jewelers must be careful when molding the metal in a diamond ring. Diamond powder of an appropriate grain size (around 50   microns) burns with a shower of sparks after ignition from a flame. Consequently, pyrotechnic compositions based on synthetic diamond powder can be prepared. The resulting sparks are of the usual red-orange color, comparable to charcoal, but show

870-450: A common writing system reflected in the histories of Japan and Korea . The Imperial Chinese tributary system was the bedrock of network of trade and foreign relations between China and its East Asian tributaries, which helped to shape much of East Asian affairs during the ancient and medieval eras. Through the tributary system, the various dynasties of Imperial China facilitated frequent economic and cultural exchange that influenced

1015-727: A continuum with carbonatites , but the latter have too much oxygen for carbon to exist in a pure form. Instead, it is locked up in the mineral calcite ( Ca C O 3 ). All three of the diamond-bearing rocks (kimberlite, lamproite and lamprophyre) lack certain minerals ( melilite and kalsilite ) that are incompatible with diamond formation. In kimberlite , olivine is large and conspicuous, while lamproite has Ti- phlogopite and lamprophyre has biotite and amphibole . They are all derived from magma types that erupt rapidly from small amounts of melt, are rich in volatiles and magnesium oxide , and are less oxidizing than more common mantle melts such as basalt . These characteristics allow

1160-459: A diamond blue (boron), yellow (nitrogen), brown (defects), green (radiation exposure), purple, pink, orange, or red. Diamond also has a very high refractive index and a relatively high optical dispersion . Most natural diamonds have ages between 1 billion and 3.5 billion years. Most were formed at depths between 150 and 250 kilometres (93 and 155 mi) in the Earth's mantle , although

1305-452: A diamond to fluoresce. Diamonds can fluoresce in a variety of colors including blue (most common), orange, yellow, white, green and very rarely red and purple. Although the causes are not well understood, variations in the atomic structure, such as the number of nitrogen atoms present are thought to contribute to the phenomenon. Diamonds can be identified by their high thermal conductivity (900– 2320 W·m ·K ). Their high refractive index

1450-789: A few have come from as deep as 800 kilometres (500 mi). Under high pressure and temperature, carbon-containing fluids dissolved various minerals and replaced them with diamonds. Much more recently (hundreds to tens of million years ago), they were carried to the surface in volcanic eruptions and deposited in igneous rocks known as kimberlites and lamproites . Synthetic diamonds can be grown from high-purity carbon under high pressures and temperatures or from hydrocarbon gases by chemical vapor deposition (CVD). Imitation diamonds can also be made out of materials such as cubic zirconia and silicon carbide . Natural, synthetic, and imitation diamonds are most commonly distinguished using optical techniques or thermal conductivity measurements. Diamond

1595-406: A fibrous matrix as nephrite is.) It only occurs in metamorphic rocks. Both nephrite and jadeite were used from prehistoric periods for hardstone carving . Jadeite has about the same hardness (between 6.0 and 7.0 Mohs hardness ) as quartz, while nephrite is slightly softer (6.0 to 6.5) and so can be worked with quartz or garnet sand, and polished with bamboo or even ground jade. However nephrite

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1740-480: A gemstone. Because it can only be scratched by other diamonds, it maintains its polish extremely well. Unlike many other gems, it is well-suited to daily wear because of its resistance to scratching—perhaps contributing to its popularity as the preferred gem in engagement or wedding rings , which are often worn every day. The hardest natural diamonds mostly originate from the Copeton and Bingara fields located in

1885-491: A measurable increase in the frequency and severity of heatwaves . The region is also expected to see the intensification of its monsoon, leading to more flooding. China has notably embarked on the sponge cities program, where cities are designed to increase the area of urban green spaces and permeable pavings in order to help deal with flash floods caused by greater precipitation extremes. Under high-warming scenarios, "critical health thresholds" for heat stress during

2030-475: A metallic fluid. The extreme conditions required for this to occur are present in the ice giants Neptune and Uranus . Both planets are made up of approximately 10 percent carbon and could hypothetically contain oceans of liquid carbon. Since large quantities of metallic fluid can affect the magnetic field, this could serve as an explanation as to why the geographic and magnetic poles of the two planets are unaligned. The most common crystal structure of diamond

2175-579: A negligible rate under those conditions. Diamond has the highest hardness and thermal conductivity of any natural material, properties that are used in major industrial applications such as cutting and polishing tools. They are also the reason that diamond anvil cells can subject materials to pressures found deep in the Earth. Because the arrangement of atoms in diamond is extremely rigid, few types of impurity can contaminate it (two exceptions are boron and nitrogen ). Small numbers of defects or impurities (about one per million of lattice atoms) can color

2320-403: A pale blue flame, and continues to burn after the source of heat is removed. By contrast, in air the combustion will cease as soon as the heat is removed because the oxygen is diluted with nitrogen. A clear, flawless, transparent diamond is completely converted to carbon dioxide; any impurities will be left as ash. Heat generated from cutting a diamond will not ignite the diamond, and neither will

2465-419: A pipe. Jadeite, with its bright emerald-green, lavender, pink, orange , yellow, red, black, white, near-colorless and brown colors was imported from Burma to China in quantity only after about 1800. The vivid white to green variety became known as fei cui (翡翠) or kingfisher jade, due to its resemblance to the feathers of the kingfisher bird. That definition was later expanded to include all other colors that

2610-590: A radical as parts of other characters. Jade in Japan was used for jade bracelets. It was a symbol of wealth and power. Leaders also used jade in rituals. It is the national stone of Japan. Examples of use in Japan can be traced back to the early Jomon period about 7,000 years ago. XRF analysis results have revealed that all jade used in Japan since the Jomon period is from Itoigawa . The jade culture that blossomed in ancient Japan respected green ones, and jade of other colors

2755-608: A shared written language, a shared culture, and a shared Confucian societal value system (involving shared Confucian philosophical tenets) once instituted by Imperial China. Other usages define China, Hong Kong, Macau, Japan, North Korea, South Korea and Taiwan as countries that constitute East Asia based on their geographic proximity as well as historical and modern cultural and economic ties, particularly with Japan and Korea in having retained strong cultural influences that originated from China. Some scholars include Vietnam as part of East Asia as it has been considered part of

2900-463: A transition between graphite and diamond are well established theoretically and experimentally. The equilibrium pressure varies linearly with temperature, between 1.7  GPa at 0 K and 12 GPa at 5000 K (the diamond/graphite/liquid triple point ). However, the phases have a wide region about this line where they can coexist. At standard temperature and pressure , 20 °C (293 K) and 1 standard atmosphere (0.10 MPa),

3045-467: A very linear trajectory which is explained by their high density. Diamond also reacts with fluorine gas above about 700 °C (1,292 °F). Diamond has a wide band gap of 5.5  eV corresponding to the deep ultraviolet wavelength of 225   nanometers. This means that pure diamond should transmit visible light and appear as a clear colorless crystal. Colors in diamond originate from lattice defects and impurities. The diamond crystal lattice

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3190-425: A volcanic rock. There are many theories for its origin, including formation in a star, but no consensus. Diamond is the hardest material on the qualitative Mohs scale . To conduct the quantitative Vickers hardness test , samples of materials are struck with a pyramid of standardized dimensions using a known force – a diamond crystal is used for the pyramid to permit a wide range of materials to be tested. From

3335-616: A wide range of jade hilted daggers, mostly owned by the former Sultans of Hyderabad. Today, it is estimated that Myanmar is the origin of upwards of 70% of the world's supply of high-quality jadeite. Most of the jadeite mined in Myanmar is not cut for use in Myanmar, instead being transported to other nations, primarily in Asia , for use in jewelry and other products. The jadeite deposits found in Kachinland , in Myanmar's northern regions

3480-449: Is 0.01% for nickel and even less for cobalt. Virtually any element can be introduced to diamond by ion implantation. Nitrogen is by far the most common impurity found in gem diamonds and is responsible for the yellow and brown color in diamonds. Boron is responsible for the blue color. Color in diamond has two additional sources: irradiation (usually by alpha particles), that causes the color in green diamonds, and plastic deformation of

3625-415: Is a solid form of pure carbon with its atoms arranged in a crystal. Solid carbon comes in different forms known as allotropes depending on the type of chemical bond. The two most common allotropes of pure carbon are diamond and graphite . In graphite, the bonds are sp orbital hybrids and the atoms form in planes, with each bound to three nearest neighbors, 120 degrees apart. In diamond, they are sp and

3770-420: Is aided by isotopic dating and modeling of the geological history. Then surveyors must go to the area and collect samples, looking for kimberlite fragments or indicator minerals . The latter have compositions that reflect the conditions where diamonds form, such as extreme melt depletion or high pressures in eclogites . However, indicator minerals can be misleading; a better approach is geothermobarometry , where

3915-728: Is also indicative, but other materials have similar refractivity. Diamonds are extremely rare, with concentrations of at most parts per billion in source rock. Before the 20th century, most diamonds were found in alluvial deposits . Loose diamonds are also found along existing and ancient shorelines , where they tend to accumulate because of their size and density. Rarely, they have been found in glacial till (notably in Wisconsin and Indiana ), but these deposits are not of commercial quality. These types of deposit were derived from localized igneous intrusions through weathering and transport by wind or water . Most diamonds come from

4060-460: Is also the only mine that produces maw sit sit, a kosmochlor-rich jade rock. Mines at Tawmaw and Hweka are mostly exhausted. From 1964 to 1981, mining was exclusively an enterprise of the Myanmar government. In 1981, 1985, and 1995, the Gemstone laws were modified to allow increasing private enterprise. In addition to this region, there are also notable mines in the neighboring Sagaing District, near

4205-405: Is another mechanical property toughness , which is a material's ability to resist breakage from forceful impact. The toughness of natural diamond has been measured as 50–65  MPa ·m . This value is good compared to other ceramic materials, but poor compared to most engineering materials such as engineering alloys, which typically exhibit toughness over 80   MPa·m . As with any material,

4350-407: Is called actinolite (the silky fibrous mineral form is one form of asbestos ). The higher the iron content, the greener the colour. Tremolite occurs in metamorphosed dolomitic limestones, and actinolite in metamorphic greenschists/glaucophane schists. Jadeite is a sodium- and aluminium-rich pyroxene . The more precious kind of jade, this is a microcrystalline interlocking growth of crystals (not

4495-414: Is called diamond cubic . It is formed of unit cells (see the figure) stacked together. Although there are 18 atoms in the figure, each corner atom is shared by eight unit cells and each atom in the center of a face is shared by two, so there are a total of eight atoms per unit cell. The length of each side of the unit cell is denoted by a and is 3.567  angstroms . The nearest neighbor distance in

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4640-440: Is closely connected with such jewellery production as Fabergé , whose workshops combined the green stone with gold, diamonds, emeralds, and rubies. In the 1950s and 1960s, there was a strong belief among many Siberians , which stemmed from tradition, that jade was part of a class of sacred objects that had life. In the 1950s and 1960s, there was a strong belief among many Mongolians , which came from ancient tradition, that jade

4785-581: Is derived (via French l'ejade and Latin ilia 'flanks, kidney area') from the Spanish term piedra de ijada (first recorded in 1565) or 'loin stone', from its reputed efficacy in curing ailments of the loins and kidneys . Nephrite is derived from lapis nephriticus , a Latin translation of the Spanish piedra de ijada . During Neolithic times, the key known sources of nephrite jade in China for utilitarian and ceremonial jade items were

4930-519: Is different from colour and texture quality. In other words, Type A jadeite is not enhanced but can have poor colour and texture. There are three main methods of enhancement, sometimes referred to as the ABC Treatment System: The jade trade in Myanmar consists of the mining , distribution, and manufacture of jadeite —a variety of jade—in the nation of Myanmar (Burma). The jadeite deposits found in Myanmar's northern regions are

5075-466: Is done from large boulders that contain bountiful deposits of jade. Jade is exposed using diamond-tipped core drills in order to extract samples. This is done to ensure that the jade meets requirements. Hydraulic spreaders are then inserted into cleavage points in the rock so that the jade can be broken away. Once the boulders are removed and the jade is accessible, it is broken down into more manageable 10-tonne pieces using water-cooled diamond saws. The jade

5220-402: Is exceptionally strong, and only atoms of nitrogen , boron , and hydrogen can be introduced into diamond during the growth at significant concentrations (up to atomic percents). Transition metals nickel and cobalt , which are commonly used for growth of synthetic diamond by high-pressure high-temperature techniques, have been detected in diamond as individual atoms; the maximum concentration

5365-419: Is formed of layers stacked in a repeating ABCABC ... pattern. Diamonds can also form an ABAB ... structure, which is known as hexagonal diamond or lonsdaleite , but this is far less common and is formed under different conditions from cubic carbon. Diamonds occur most often as euhedral or rounded octahedra and twinned octahedra known as macles . As diamond's crystal structure has a cubic arrangement of

5510-771: Is found in small quarries and as pebbles and boulders in the rivers flowing from the Kuen-Lun mountain range eastward into the Takla-Makan desert area. The river jade collection is concentrated in the Yarkand , the White Jade ( Yurungkash ) and Black Jade ( Karakash ) Rivers. From the Kingdom of Khotan , on the southern leg of the Silk Road , yearly tribute payments consisting of the most precious white jade were made to

5655-412: Is higher for flawless, pure crystals oriented to the <111> direction (along the longest diagonal of the cubic diamond lattice). Therefore, whereas it might be possible to scratch some diamonds with other materials, such as boron nitride , the hardest diamonds can only be scratched by other diamonds and nanocrystalline diamond aggregates . The hardness of diamond contributes to its suitability as

5800-404: Is hybrid rock with a chaotic mixture of small minerals and rock fragments ( clasts ) up to the size of watermelons. They are a mixture of xenocrysts and xenoliths (minerals and rocks carried up from the lower crust and mantle), pieces of surface rock, altered minerals such as serpentine , and new minerals that crystallized during the eruption. The texture varies with depth. The composition forms

5945-647: Is in the form of micro/nanoscale wires or needles (~100–300   nanometers in diameter, micrometers long), they can be elastically stretched by as much as 9–10 percent tensile strain without failure, with a maximum local tensile stress of about 89–98 GPa , very close to the theoretical limit for this material. Other specialized applications also exist or are being developed, including use as semiconductors : some blue diamonds are natural semiconductors, in contrast to most diamonds, which are excellent electrical insulators . The conductivity and blue color originate from boron impurity. Boron substitutes for carbon atoms in

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6090-477: Is one of the 4C's (color, clarity, cut and carat weight) that helps in identifying the quality of diamonds. The Gemological Institute of America (GIA) developed 11 clarity scales to decide the quality of a diamond for its sale value. The GIA clarity scale spans from Flawless (FL) to included (I) having internally flawless (IF), very, very slightly included (VVS), very slightly included (VS) and slightly included (SI) in between. Impurities in natural diamonds are due to

6235-473: Is one of the most extensive sea-based trade networks of a single geological material in the prehistoric world. It was in existence for at least 3,000 years, where its peak production was from 2000 BCE to 500 CE, older than the Silk Road in mainland Eurasia. It began to wane during its final centuries from 500 CE until 1000 CE. The entire period of the network was a golden age for the diverse animist societies of

6380-797: Is partially oxidized. The oxidized surface can be reduced by heat treatment under hydrogen flow. That is to say, this heat treatment partially removes oxygen-containing functional groups. But diamonds (sp C) are unstable against high temperature (above about 400 °C (752 °F)) under atmospheric pressure. The structure gradually changes into sp C above this temperature. Thus, diamonds should be reduced below this temperature. At room temperature, diamonds do not react with any chemical reagents including strong acids and bases. In an atmosphere of pure oxygen, diamond has an ignition point that ranges from 690 °C (1,274 °F) to 840 °C (1,540 °F); smaller crystals tend to burn more easily. It increases in temperature from red to white heat and burns with

6525-769: Is possible to treat regular diamonds under a combination of high pressure and high temperature to produce diamonds that are harder than the diamonds used in hardness gauges. Diamonds cut glass, but this does not positively identify a diamond because other materials, such as quartz, also lie above glass on the Mohs scale and can also cut it. Diamonds can scratch other diamonds, but this can result in damage to one or both stones. Hardness tests are infrequently used in practical gemology because of their potentially destructive nature. The extreme hardness and high value of diamond means that gems are typically polished slowly, using painstaking traditional techniques and greater attention to detail than

6670-517: Is sometimes grouped with Central Asian countries such as Turkmenistan, Kyrgyzstan, and Kazakhstan. Xinjiang and Tibet are sometimes seen as part of Central Asia (see also Greater Central Asia ). Broader and looser definitions by international agencies and organisations such as the World Bank refer to East Asia as the "three major Northeast Asian economies, i.e. mainland China , Japan, and South Korea ", as well as Mongolia, North Korea ,

6815-454: Is the case with most other gemstones; these tend to result in extremely flat, highly polished facets with exceptionally sharp facet edges. Diamonds also possess an extremely high refractive index and fairly high dispersion. Taken together, these factors affect the overall appearance of a polished diamond and most diamantaires still rely upon skilled use of a loupe (magnifying glass) to identify diamonds "by eye". Somewhat related to hardness

6960-749: Is the highest quality jadeite in the world, considered precious by sources in China going as far back as the 10th century. Jadeite in Myanmar is primarily found in the "Jade Tract" located in Lonkin Township in Kachin State in northern Myanmar which encompasses the alluvial region of the Uyu River between the 25th and 26th parallels. Present-day extraction of jade in this region occurs at the Phakant-gyi, Maw Sisa, Tin Tin, and Khansee mines. Khansee

7105-696: Is then loaded onto trucks and transported to the proper storage facilities. Russia imported jade from China for a long time, but in the 1860s its own jade deposits were found in Siberia. Today, the main deposits of jade are located in Eastern Siberia, but jade is also extracted in the Polar Urals and in the Krasnoyarsk territory (Kantegirskoye and Kurtushibinskoye deposits). Russian raw jade reserves are estimated at 336 tons. Russian jade culture

7250-441: Is tougher and more resistant to breakage. Among the earliest known jade artifacts excavated from prehistoric sites are simple ornaments with bead, button, and tubular shapes. Additionally, jade was used for adze heads, knives , and other weapons , which can be delicately shaped. As metal-working technologies became available, the beauty of jade made it valuable for ornaments and decorative objects. The name Nephrite derives from

7395-457: Is used to denote the several types of stone known in English as "jade" (e.g. 玉器, jadewares), such as jadeite (硬玉, 'hard jade', another name for 翡翠) and nephrite (軟玉, 'soft jade'). While still in use, the terms "hard jade" and "soft jade" resulted from a mistranslation by a Japanese geologist, and should be avoided. But because of the value added culturally to jades throughout Chinese history,

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7540-485: Is very sparsely distributed, with Mongolia having the lowest population density of a sovereign state . The overall population density of the region is 133 inhabitants per square kilometre (340/sq mi), about three times the world average of 45/km (120/sq mi). China was the first region settled in East Asia and was undoubtedly the core of East Asian civilization from where other parts of East Asia were formed. The various other regions in East Asia were selective in

7685-739: The Earth's mantle , and most of this section discusses those diamonds. However, there are other sources. Some blocks of the crust, or terranes , have been buried deep enough as the crust thickened so they experienced ultra-high-pressure metamorphism . These have evenly distributed microdiamonds that show no sign of transport by magma. In addition, when meteorites strike the ground, the shock wave can produce high enough temperatures and pressures for microdiamonds and nanodiamonds to form. Impact-type microdiamonds can be used as an indicator of ancient impact craters. Popigai impact structure in Russia may have

7830-538: The Nalgonda district , Telangana , India is home to a 5-foot (1.5 m) high sculpture of Mahavira that is carved entirely out of jade. India is also noted for its craftsman tradition of using large amounts of green serpentine or false jade obtained primarily from Afghanistan in order to fashion jewellery and ornamental items such as sword hilts and dagger handles. The Salar Jung Museum in Hyderabad has

7975-560: The Nara period , Japan began to aggressively import Chinese culture and styles of government which included Confucian protocol that served as a foundation for Japanese culture as well as political and social philosophy. The Japanese also created laws adopted from the Chinese legal system that was used to govern in addition to the kimono , which was inspired from Chinese hanfu during the eighth century. For many centuries, most notably from

8120-566: The New England area in New South Wales , Australia. These diamonds are generally small, perfect to semiperfect octahedra, and are used to polish other diamonds. Their hardness is associated with the crystal growth form, which is single-stage crystal growth. Most other diamonds show more evidence of multiple growth stages, which produce inclusions, flaws, and defect planes in the crystal lattice, all of which affect their hardness. It

8265-943: The Olympic Council of Asia (OCA), as well as the Pacific island of Guam , which is a member of the Oceania National Olympic Committees . It is one of five Regional Games of the OCA. The others are the Central Asian Games , the Southeast Asian Games (SEA Games), the South Asian Games and the West Asian Games . [REDACTED] Seoul Diamond Diamond is a solid form of

8410-514: The Philippines by the animist indigenous Filipinos. Some were also processed in Vietnam , while the peoples of Brunei , Cambodia , Indonesia , Malaysia , Singapore , and Thailand also participated in the massive animist-led nephrite jade trading network, where other commodities were also traded. Participants in the network at the time had a majority animist population. The maritime road

8555-620: The Russian Far East , and Siberia . The Council on Foreign Relations includes the Russia Far East, Mongolia, and Nepal . The World Bank also acknowledges the roles of Chinese special administrative regions Hong Kong and Macau , as well as Taiwan , a country with limited recognition. The Economic Research Institute for Northeast Asia defines the region as "China, Japan, the Koreas , Nepal, Mongolia, and eastern regions of

8700-553: The Russian Federation ". The UNSD definition of East Asia is based on statistical convenience, but others commonly use the same definition of Mainland China, Hong Kong, Macau, Mongolia, North Korea, South Korea, Taiwan, and Japan. Certain Japanese islands are associated with Oceania due to non-continental geology, distance from mainland Asia or biogeographical similarities with Micronesia . Some groups, such as

8845-559: The Wawa belt of the Superior province in Canada and microdiamonds in the island arc of Japan are found in a type of rock called lamprophyre . Kimberlites can be found in narrow (1 to 4 meters) dikes and sills, and in pipes with diameters that range from about 75 m to 1.5 km. Fresh rock is dark bluish green to greenish gray, but after exposure rapidly turns brown and crumbles. It

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8990-610: The World Health Organization , categorize China, Japan and Korea with Australia and the rest of Oceania. The World Health Organization label this region the "Western Pacific", with East Asia not being used in their concept of major world regions. Their definition of this region further includes Mongolia and the adjacent area of Cambodia , as well as the countries of the South East Asia Archipelago (excluding East Timor and Indonesia ). In

9135-611: The economic rise of Hong Kong , South Korea , and Taiwan , in addition to the respective handovers of Hong Kong and Macau near the end of the twentieth century. The onset of the 21st-century in East Asia led to the integration of Mainland China into the global economy through its entry in the World Trade Organization while also enhancing its emerging international status as a potential world power reinforced with its aim of restoring its historical established significance and enduring international prominence in

9280-660: The frontier regions ), 16 native to the island of Taiwan (collectively known as Taiwanese indigenous peoples ), one native to the major Japanese island of Hokkaido (the Ainu ) and four native to Mongolia ( Turkic peoples ). The Ryukyuan people are an unrecognized ethnic group indigenous to the Ryukyu Islands in southern Japan, which stretch from Kyushu to Taiwan. There are also several unrecognized indigenous ethnic groups in mainland China and Taiwan. East Asians comprise around 1.7 billion people, making up about 33% of

9425-436: The lithosphere . Such depths occur below cratons in mantle keels , the thickest part of the lithosphere. These regions have high enough pressure and temperature to allow diamonds to form and they are not convecting, so diamonds can be stored for billions of years until a kimberlite eruption samples them. Host rocks in a mantle keel include harzburgite and lherzolite , two type of peridotite . The most dominant rock type in

9570-536: The normal color range , and applies a grading scale from "D" (colorless) to "Z" (light yellow). Yellow diamonds of high color saturation or a different color, such as pink or blue, are called fancy colored diamonds and fall under a different grading scale. In 2008, the Wittelsbach Diamond , a 35.56-carat (7.112 g) blue diamond once belonging to the King of Spain, fetched over US$ 24 million at

9715-402: The upper mantle , peridotite is an igneous rock consisting mostly of the minerals olivine and pyroxene ; it is low in silica and high in magnesium . However, diamonds in peridotite rarely survive the trip to the surface. Another common source that does keep diamonds intact is eclogite , a metamorphic rock that typically forms from basalt as an oceanic plate plunges into the mantle at

9860-903: The ' mere ' (short club), and the hei-tiki (neck pendant). Nephrite jewellery of Maori design is widely popular with locals and tourists, although some of the jade used for these is now imported from British Columbia and elsewhere. Pounamu taonga include tools such as toki (adzes), whao (chisels), whao whakakōka (gouges), ripi pounamu (knives), scrapers , awls, hammer stones, and drill points. Hunting tools include matau (fishing hooks) and lures, spear points, and kākā poria (leg rings for fastening captive birds); weapons such as mere (short handled clubs); and ornaments such as pendants ( hei-tiki , hei matau and pekapeka), ear pendants (kuru and kapeu), and cloak pins. Functional pounamu tools were widely worn for both practical and ornamental reasons, and continued to be worn as purely ornamental pendants (hei kakï) even after they were no longer used as tools. Jade

10005-737: The 1860s. Around the same time, the Meiji Restoration in Japan sparked rapid societal transformation from an isolated feudal state into East Asia's first industrialised nation. The modern and militarily powerful Japan would galvanise its position in the Orient as East Asia's greatest power with a global mission poised to advance to lead the entire world. By the early 1900s, the Empire of Japan succeeded in asserting itself as East Asia's most dominant geopolitical force. With its newly found international status, Japan would begin to challenge

10150-555: The 21st century will be at times breached, in areas like the North China Plain . China, Japan and the Republic of Korea are expected to see some of the largest economic losses caused by sea level rise. The city of Guangzhou is projected to experience the single largest annual economic losses from sea level rise in the world, potentially reaching US$ 254 million by 2050. Under the highest climate change scenario and in

10295-675: The 21st century. Baseball is one of the main sports in East Asia, having been introduced through mid-19th century American contact and further spread by the Japanese Empire. The game has gained millions of fans in China since the 2010s. Formerly the East Asian Games , it is a multi-sport event organized by the East Asian Games Association (EAGA) and held every four years since 2019 among athletes from East Asian countries and territories of

10440-495: The 7th to the 14th centuries, China stood as East Asia's most advanced civilization and foremost military and economic power, exerting its influence as the transmission of advanced Chinese cultural practices and ways of thinking greatly shaped the region up until the nineteenth century. As East Asia's connections with Europe and the Western world strengthened during the late nineteenth century, China's power began to decline. By

10585-480: The Chinese Imperial court and there worked into objets d'art by skilled artisans as jade had a status-value exceeding that of gold or silver . Jade became a favourite material for the crafting of Chinese scholars' objects, such as rests for calligraphy brushes, as well as the mouthpieces of some opium pipes , due to the belief that breathing through jade would bestow longevity upon smokers who used such

10730-941: The Chinese influences they adopted into their local customs. Historian Ping-ti Ho referred to China as the cradle of Eastern civilization, in parallel with the cradle of Middle Eastern civilization along the Fertile Crescent encompassing Mesopotamia and Ancient Egypt as well as the cradle of Western civilization encompassing Ancient Greece . Chinese civilization emerged early, and prefigured other East Asian civilisations. Throughout history, imperial China would exert cultural, economic, technological, and political influence on its neighbours. Succeeding Chinese dynasties exerted enormous influence across East Asia culturally, economically, politically and militarily for over two millennia. The tributary system of China shaped much of East Asia's history for over two millennia due to Imperial China's economic and cultural influence over

10875-624: The European colonial powers and inextricably took on a more active role within the East Asian geopolitical order and world affairs at large. Flexing its nascent political and military might, Japan soundly defeated the stagnant Qing dynasty during the First Sino-Japanese War as well as defeating Russia in the Russo-Japanese War in 1905; the first major military victory in the modern era of an East Asian power over

11020-457: The Greek word meaning "kidney". This is because in ancient times it was believed that wearing this kind of jade around the waist could cure kidney disease. Nephrite can be found in a creamy white form (known in China as "mutton fat" jade) as well as in a variety of light green colours, whereas jadeite shows more colour variations, including blue, brown, red, black, dark green, lavender and white. Of

11165-621: The Han Chinese conquered the northern part of the Korean peninsula and established a province called Lelang . Chinese influences were transmitted and soon took root in Korea through the inclusion of the Chinese writing system, monetary system, rice culture, philosophical schools of thought, and Confucian political institutions. Jomon society in ancient Japan incorporated wet-rice cultivation and metallurgy through its contact with Korea. Starting in

11310-704: The Middle Mumun Pottery Period ( c.  850 –550 BC). Comma-shaped jades are found on some of the gold crowns of Silla royalty ( c.  300 /400–668 AD) and sumptuous elite burials of the Korean Three Kingdoms . After the state of Silla united the Korean Peninsula in 668, the widespread popularisation of death rituals related to Buddhism resulted in the decline of the use of jade in burials as prestige mortuary goods. The Jain temple of Kolanpak in

11455-638: The Tang political system, Prince Naka no oe launched the Taika Reform in 645 AD where he radically transformed Japan's political bureaucracy into a more centralised bureaucratic empire. The Japanese also adopted Mahayana Buddhism, Chinese style architecture, and the imperial court's rituals and ceremonies, including the orchestral music and state dances had Tang influences. Written Chinese gained prestige and aspects of Tang culture such as poetry , calligraphy , and landscape painting became widespread. During

11600-638: The Valley of Mexico . Jade is classified into three main types: Type A, Type B, and Type C. Type A jade refers to natural, untreated jadeite jade, prized for its purity and vibrant colors. It is the most valuable and sought-after type, often characterized by its vivid green hues and high translucency. Type A jade is revered for its symbolism of purity, harmony, and protection in various cultures, especially in East Asia where it holds significant cultural and spiritual importance. Types B and C have been enhanced with resin and colourant respectively. The English word jade

11745-668: The absence of adaptation, cumulative economic losses caused by sea level rise in Guangzhou would exceed US$ 1 trillion by 2100. Shanghai is also expected to experience annual losses of around 1% of the local GDP in the absence of adaptation. The Yangtze River basin is a sensitive and biodiverse ecosystem, yet around 20% of its species may be lost throughout the century under 2 °C (3.6 °F) and ~43% under 4.5 °C (8.1 °F). China, North Korea, South Korea and Taiwan are all unrecognised by at least one other East Asian state because of severe ongoing political tensions in

11890-462: The atoms form tetrahedra, with each bound to four nearest neighbors. Tetrahedra are rigid, the bonds are strong, and, of all known substances, diamond has the greatest number of atoms per unit volume, which is why it is both the hardest and the least compressible . It also has a high density, ranging from 3150 to 3530 kilograms per cubic metre (over three times the density of water) in natural diamonds and 3520 kg/m in pure diamond. In graphite,

12035-420: The atoms, they have many facets that belong to a cube , octahedron, rhombicosidodecahedron , tetrakis hexahedron , or disdyakis dodecahedron . The crystals can have rounded-off and unexpressive edges and can be elongated. Diamonds (especially those with rounded crystal faces) are commonly found coated in nyf , an opaque gum-like skin. Some diamonds contain opaque fibers. They are referred to as opaque if

12180-410: The bonds between nearest neighbors are even stronger, but the bonds between parallel adjacent planes are weak, so the planes easily slip past each other. Thus, graphite is much softer than diamond. However, the stronger bonds make graphite less flammable. Diamonds have been adopted for many uses because of the material's exceptional physical characteristics. It has the highest thermal conductivity and

12325-472: The bounds of the Asia-Pacific, although the term Indo-Pacific is more commonly used for such a definition. Observers preferring a broader definition of "East Asia" often use the term Northeast Asia to refer to China, the Korean Peninsula, and Japan, with the region of Southeast Asia covering the ten ASEAN countries. This usage, which is seen in economic and diplomatic discussions, is at odds with

12470-512: The carbon source is more likely carbonate rocks and organic carbon in sediments, rather than coal. Diamonds are far from evenly distributed over the Earth. A rule of thumb known as Clifford's rule states that they are almost always found in kimberlites on the oldest part of cratons , the stable cores of continents with typical ages of 2.5   billion years or more. However, there are exceptions. The Argyle diamond mine in Australia ,

12615-488: The classics of Chinese literature and culture were seen as the foundations for a civilized life in East Asia. Imperial China served as a vehicle through which the adoption of Confucian ethical philosophy, Chinese calendar system, political and legal systems, architectural style, diet, terminology, institutions, religious beliefs, imperial examinations that emphasised a knowledge of Chinese classics, political philosophy and cultural value systems, as well as historically sharing

12760-436: The coloration, while pure or nearly pure diamonds are transparent and colorless. Most diamond impurities replace a carbon atom in the crystal lattice , known as a carbon flaw . The most common impurity, nitrogen, causes a slight to intense yellow coloration depending upon the type and concentration of nitrogen present. The Gemological Institute of America (GIA) classifies low saturation yellow and brown diamonds as diamonds in

12905-501: The compositions of minerals are analyzed as if they were in equilibrium with mantle minerals. Finding kimberlites requires persistence, and only a small fraction contain diamonds that are commercially viable. The only major discoveries since about 1980 have been in Canada. Since existing mines have lifetimes of as little as 25 years, there could be a shortage of new diamonds in the future. Diamonds are dated by analyzing inclusions using

13050-560: The context of business and economics, "East Asia" is sometimes used to refer to the geographical area covering ten Southeast Asian countries in ASEAN , Greater China , Japan, and Korea. However, in this context, the term " Far East " is used by the Europeans to cover ASEAN countries and the countries in East Asia. On rare occasions, the term is also sometimes taken to include India and other South Asian countries that are not situated within

13195-433: The cultures of Japan and Korea and drew them into a Chinese international order. The Imperial Chinese tributary system shaped much of East Asia's foreign policy and trade for over two millennia due to Imperial China's economic and cultural dominance over the region, and thus played a huge role in the history of East Asia in particular. The relationship between China and its cultural influence on East Asia has been compared to

13340-598: The decay of radioactive isotopes. Depending on the elemental abundances, one can look at the decay of rubidium to strontium , samarium to neodymium , uranium to lead , argon-40 to argon-39 , or rhenium to osmium . Those found in kimberlites have ages ranging from 1 to 3.5 billion years , and there can be multiple ages in the same kimberlite, indicating multiple episodes of diamond formation. The kimberlites themselves are much younger. Most of them have ages between tens of millions and 300 million years old, although there are some older exceptions (Argyle, Premier and Wawa). Thus,

13485-470: The diamond crystal lattice. Plastic deformation is the cause of color in some brown and perhaps pink and red diamonds. In order of increasing rarity, yellow diamond is followed by brown, colorless, then by blue, green, black, pink, orange, purple, and red. "Black", or carbonado , diamonds are not truly black, but rather contain numerous dark inclusions that give the gems their dark appearance. Colored diamonds contain impurities or structural defects that cause

13630-506: The diamond lattice is 1.732 a /4 where a is the lattice constant, usually given in Angstrøms as a = 3.567 Å, which is 0.3567 nm. A diamond cubic lattice can be thought of as two interpenetrating face-centered cubic lattices with one displaced by 1 ⁄ 4 of the diagonal along a cubic cell, or as one lattice with two atoms associated with each lattice point. Viewed from a <1 1 1> crystallographic direction , it

13775-415: The diamond lattice, donating a hole into the valence band . Substantial conductivity is commonly observed in nominally undoped diamond grown by chemical vapor deposition . This conductivity is associated with hydrogen -related species adsorbed at the surface, and it can be removed by annealing or other surface treatments. Thin needles of diamond can be made to vary their electronic band gap from

13920-407: The diamonds' surface cannot be wet by water, but can be easily wet and stuck by oil. This property can be utilized to extract diamonds using oil when making synthetic diamonds. However, when diamond surfaces are chemically modified with certain ions, they are expected to become so hydrophilic that they can stabilize multiple layers of water ice at human body temperature . The surface of diamonds

14065-429: The element carbon with its atoms arranged in a crystal structure called diamond cubic . Diamond as a form of carbon is a tasteless, odourless, strong, brittle solid, colourless in pure form, a poor conductor of electricity, and insoluble in water. Another solid form of carbon known as graphite is the chemically stable form of carbon at room temperature and pressure , but diamond is metastable and converts to it at

14210-449: The fibers grow from a clear substrate or fibrous if they occupy the entire crystal. Their colors range from yellow to green or gray, sometimes with cloud-like white to gray impurities. Their most common shape is cuboidal, but they can also form octahedra, dodecahedra, macles, or combined shapes. The structure is the result of numerous impurities with sizes between 1 and 5 microns. These diamonds probably formed in kimberlite magma and sampled

14355-453: The fourth century AD and Japan by the seventh century AD, Japan and Korea actively began to incorporate Chinese influences such as Confucianism , the use of Chinese characters , architecture , state institutions, political philosophies , religion, urban planning, and various scientific and technological methods into their culture and society through direct contacts with Tang China and succeeding Chinese dynasties. Drawing inspiration from

14500-571: The fourth century AD, Japan adopted Chinese characters , which remain integral to the Japanese writing system . Utilizing the Chinese writing system allowed the Japanese to conduct their daily activities, maintain historical records and give form to various ideas, thoughts, and philosophies. During the Tang dynasty , China exerted its greatest influence on East Asia as various aspects of Chinese culture spread to Japan and Korea . The establishment of

14645-488: The greater Chinese cultural sphere . Though Confucianism continues to play an important role in Vietnamese culture, Chinese characters are no longer used in its written language and many scholarly organizations classify Vietnam as a Southeast Asian country. Mongolia is geographically north of Mainland China yet Confucianism and the Chinese writing system and culture had limited impact on Mongolian society. Thus, Mongolia

14790-408: The hardness and transparency of diamond, are the reasons that diamond anvil cells are the main tool for high pressure experiments. These anvils have reached pressures of 600 GPa . Much higher pressures may be possible with nanocrystalline diamonds. Usually, attempting to deform bulk diamond crystal by tension or bending results in brittle fracture. However, when single crystalline diamond

14935-455: The highest sound velocity. It has low adhesion and friction, and its coefficient of thermal expansion is extremely low. Its optical transparency extends from the far infrared to the deep ultraviolet and it has high optical dispersion . It also has high electrical resistance. It is chemically inert, not reacting with most corrosive substances, and has excellent biological compatibility. The equilibrium pressure and temperature conditions for

15080-539: The historical influence of Greco-Roman civilization on classical Western civilisation. Religion in East Asia (2020) *Japan switched the date to the Gregorian calendar after the Meiji Restoration. *Not always on that Gregorian date, sometimes April 4. East Asian popular culture, such as anime and manga from Japan and K-pop and K-dramas from South Korea, have become highly popular worldwide in

15225-554: The historical meanings of both "East Asia" and "Northeast Asia". The Council on Foreign Relations of the United States defines Northeast Asia as Japan and Korea. East Asia is home to many climatic zones. It also has unique weather patterns such as the East Asian rainy season and the East Asian Monsoon . Like the rest of the world, East Asia has been getting warmer due to climate change, and there had been

15370-738: The indigenous populations of northeastern China such as the Manchus . The major languages in East Asia include Mandarin Chinese , Japanese , and Korean . The major ethnic groups of East Asia include the Han in China and Taiwan, Yamato in Japan, and Koreans in North and South Korea. and Mongols in Mongolia. There are 76 officially-recognized minority or indigenous ethnic groups in East Asia; 55 native to mainland China (including Hui , Manchus, Chinese Mongols , Tibetans, Uyghurs , and Zhuang in

15515-423: The kimberlites formed independently of the diamonds and served only to transport them to the surface. Kimberlites are also much younger than the cratons they have erupted through. The reason for the lack of older kimberlites is unknown, but it suggests there was some change in mantle chemistry or tectonics. No kimberlite has erupted in human history. Most gem-quality diamonds come from depths of 150–250 km in

15660-411: The largest producer of diamonds by weight in the world, is located in a mobile belt , also known as an orogenic belt , a weaker zone surrounding the central craton that has undergone compressional tectonics. Instead of kimberlite , the host rock is lamproite . Lamproites with diamonds that are not economically viable are also found in the United States, India, and Australia. In addition, diamonds in

15805-502: The largest unified population in East Asia, the most literate and urbanised as well as being the most economically developed, as well as the most technologically and culturally advanced civilization in the region at the time. Cultural and religious interaction between the Chinese and other regional East Asian dynasties and kingdoms occurred. China's impact and influence on Korea began with the Han dynasty's northeastern expansion in 108 BC when

15950-533: The latter lost Mainland China to the People's Republic of China in the Chinese Civil War . During the latter half of the twentieth century, the region would see the post war economic miracle of Japan , which ushered in three decades of unprecedented growth, only to experience an economic slowdown during the 1990s , but nonetheless Japan continues to remain a global economic power. East Asia would also see

16095-467: The macroscopic geometry of a diamond contributes to its resistance to breakage. Diamond has a cleavage plane and is therefore more fragile in some orientations than others. Diamond cutters use this attribute to cleave some stones before faceting them. "Impact toughness" is one of the main indexes to measure the quality of synthetic industrial diamonds. Diamond has compressive yield strength of 130–140   GPa. This exceptionally high value, along with

16240-555: The material was highly symbolic, and it was often employed in the performance of ideological practices and rituals . Jade was first identified in Canada by Chinese settlers in 1886 in British Columbia. At this time jade was considered worthless because the settlers were searching for gold. Jade was not commercialized in Canada until the 1970s. The mining business Loex James Ltd., which was started by two Californians, began commercial mining of Canadian jade in 1972. Mining

16385-652: The medieval Tang dynasty rekindled the impetus of Chinese expansionism across the geopolitical confines of East Asia. Similar to its Han predecessor, Tang China reasserted itself as the center of East Asian geopolitical influence during the early medieval period which spearheaded and marked another golden age in Chinese history . During the Tang dynasty, China exerted its greatest influence on East Asia as various aspects of Chinese culture spread to Japan and Korea. In addition, Tang China also managed to maintain control over northern Vietnam and northern Korea . As full-fledged medieval East Asian states were established, Korea by

16530-591: The melting point of diamond increases slowly with increasing pressure; but at pressures of hundreds of GPa, it decreases. At high pressures, silicon and germanium have a BC8 body-centered cubic crystal structure, and a similar structure is predicted for carbon at high pressures. At 0 K , the transition is predicted to occur at 1100 GPa . Results published in an article in the scientific journal Nature Physics in 2010 suggest that, at ultra-high pressures and temperatures (about 10 million atmospheres or 1 TPa and 50,000 °C), diamond melts into

16675-579: The melts to carry diamonds to the surface before they dissolve. Kimberlite pipes can be difficult to find. They weather quickly (within a few years after exposure) and tend to have lower topographic relief than surrounding rock. If they are visible in outcrops, the diamonds are never visible because they are so rare. In any case, kimberlites are often covered with vegetation, sediments, soils, or lakes. In modern searches, geophysical methods such as aeromagnetic surveys , electrical resistivity , and gravimetry , help identify promising regions to explore. This

16820-420: The mid-nineteenth century, the weakening Qing dynasty became fraught with political corruption, obstacles and stagnation that was incapable of rejuvenating itself as a world power in contrast to the industrializing Imperial European colonial powers and a rapidly modernizing Japan. The United States Commodore Matthew C. Perry would open Japan to Western influence , and the country would expand in earnest after

16965-469: The normal 5.6 eV to near zero by selective mechanical deformation. High-purity diamond wafers 5 cm in diameter exhibit perfect resistance in one direction and perfect conductance in the other, creating the possibility of using them for quantum data storage. The material contains only 3 parts per million of nitrogen. The diamond was grown on a stepped substrate, which eliminated cracking. Diamonds are naturally lipophilic and hydrophobic , which means

17110-779: The now-depleted deposits in the Ningshao area in the Yangtze River Delta ( Liangzhu culture 3400–2250 BC) and in an area of the Liaoning province and Inner Mongolia ( Hongshan culture 4700–2200 BC). Dushan Jade (a rock composed largely of anorthite feldspar and zoisite) was being mined as early as 6000 BC. In the Yin Ruins of the Shang Dynasty (1600 to 1050 BC) in Anyang, Dushan Jade ornaments were unearthed in

17255-584: The population in Continental Asia and 20% of the global population. The region is home to major world metropolises such as Beijing – Tianjin , Busan – Daegu – Ulsan – Changwon , Guangzhou , Hong Kong , Osaka – Kyoto – Kobe , Seoul , Shanghai , Shenzhen , Taipei , and Tokyo . Although the coastal and riparian areas of the region form one of the world's most populated places, the population in Mongolia and Western China , both landlocked areas,

17400-620: The presence of natural minerals and oxides. The clarity scale grades the diamond based on the color, size, location of impurity and quantity of clarity visible under 10x magnification. Inclusions in diamond can be extracted by optical methods. The process is to take pre-enhancement images, identifying the inclusion removal part and finally removing the diamond facets and noises. Between 25% and 35% of natural diamonds exhibit some degree of fluorescence when examined under invisible long-wave ultraviolet light or higher energy radiation sources such as X-rays and lasers. Incandescent lighting will not cause

17545-417: The present day include the Japanese , Korean , and Mongolian civilizations. Various other civilizations existed as independent polities in East Asia in the past but have since been absorbed into neighbouring civilizations in the present day, such as Tibet , Manchuria , and Ryukyu (Okinawa), among many others. Taiwan has a relatively young history in the region after the prehistoric era ; originally, it

17690-489: The principal sources of modern gem jadeite. In the area of Mogaung in the Myitkyina District of Upper Burma, jadeite formed a layer in the dark-green serpentine, and has been quarried and exported for well over a hundred years. Canada provides the major share of modern lapidary nephrite. Jade may be enhanced (sometimes called "stabilized"). Some merchants will refer to these as grades, but degree of enhancement

17835-817: The region's prominence has facilitated the transmission of ideas, cultural exchanges, commercial trade, scientific and technological cooperation, and migration, as its position and proximity to both the Pacific Ocean and the Continental Asian landmass makes it strategically significant for facilitating international maritime trade and transportation. The contemporary economic, technological, political, and social integration of East Asia coupled with its rich history of diversity, division, and divergent development have all contributed to its enduring complexity, scientific and technological advancement, cultural richness, economic prosperity, and geopolitical significance on

17980-508: The region, and thus played a huge role in the history of East Asia in particular. Imperial China's cultural preeminence not only led the country to become East Asia's first literate nation in the entire region, it also supplied Japan and Korea with Chinese loanwords and linguistic influences rooted in their writing systems. Under Emperor Wu of Han , the Han dynasty made China the regional powerhouse in East Asia, projecting much of its imperial influence onto its neighbours. Han China hosted

18125-416: The region, specifically the division of Korea and the political status of Taiwan . thousands (2023) [REDACTED] The culture of East Asia has been deeply influenced by China , as it was the civilization that had the most dominant influence in the region throughout the ages that ultimately laid the foundation for East Asian civilization. The vast knowledge and ingenuity of Chinese civilization and

18270-1172: The region. Nephrite jade in New Zealand is known as pounamu in the Māori language (often called "greenstone" in New Zealand English ), and plays an important role in Māori culture . It is considered a taonga , or treasure, and therefore protected under the Treaty of Waitangi , and the exploitation of it is restricted and closely monitored. It is found only in the South Island of New Zealand, known as Te Wai Pounamu in Māori —"The [land of] Greenstone Water", or Te Wahi Pounamu —"The Place of Greenstone". Pounamu taonga increase in mana (prestige) as they pass from one generation to another. The most prized taonga are those with known histories going back many generations. These are believed to have their own mana and were often given as gifts to seal important agreements. Tools, weapons and ornaments were made of it; in particular adzes ,

18415-451: The rock is found in. It quickly became almost as popular as nephrite and a favorite of Qing Dynasty's aristocracy, while scholars still had strong attachment to nephrite (white jade, or Hetian jade), which they deemed to be the symbol of a nobleman. In the history of the art of the Chinese empire, jade has had a special significance, comparable with that of gold and diamonds in the West. Jade

18560-562: The root from which many other East Asian calendars are derived. Major religions in East Asia include Buddhism (mostly Mahayana ), Confucianism and Neo-Confucianism , Taoism , ancestral worship , and Chinese folk religion in Mainland China, Hong Kong , Macau and Taiwan , Shinto in Japan, and Christianity and Musok in Korea. Tengerism and Tibetan Buddhism are prevalent among Mongols and Tibetans while other religions such as Shamanism are widespread among

18705-529: The size of the resulting indentation, a Vickers hardness value for the material can be determined. Diamond's great hardness relative to other materials has been known since antiquity, and is the source of its name. This does not mean that it is infinitely hard, indestructible, or unscratchable. Indeed, diamonds can be scratched by other diamonds and worn down over time even by softer materials, such as vinyl phonograph records . Diamond hardness depends on its purity, crystalline perfection, and orientation: hardness

18850-515: The source of the highest quality jadeite in the world, noted by sources in China going as far back as the 10th century. Chinese culture places significant weight on the meaning of jade; as their influence has grown in Myanmar, so has the jade industry and the practice of exporting the precious mineral. East Asian East Asia is a geographical and cultural region of Asia including China , Japan , Mongolia , North Korea , South Korea , and Taiwan . Additionally, Hong Kong and Macau are

18995-419: The stable phase of carbon is graphite, but diamond is metastable and its rate of conversion to graphite is negligible. However, at temperatures above about 4500 K , diamond rapidly converts to graphite. Rapid conversion of graphite to diamond requires pressures well above the equilibrium line: at 2000 K , a pressure of 35 GPa is needed. Above the graphite–diamond–liquid carbon triple point,

19140-572: The tomb of the Shang kings. Jade was considered to be the "imperial gem" and was used to create many utilitarian and ceremonial objects, from indoor decorative items to jade burial suits . From the earliest Chinese dynasties to the present, the jade deposits most used were not only those of Khotan in the Western Chinese province of Xinjiang but other parts of China as well, such as Lantian, Shaanxi . There, white and greenish nephrite jade

19285-522: The towns of Nasibon and Natmaw and Hkamti. Sagaing is a district in Myanmar proper, not a part of the ethic Kachin State. Carved nephrite jade was the main commodity trade during the historical Maritime Jade Road , an extensive trading network connecting multiple areas in Southeast Asia. The nephrite jade was mined in eastern Taiwan by the animist Taiwanese indigenous peoples and processed mostly in

19430-461: The two special administrative regions of China . The economies of China , Japan , South Korea , and Taiwan are among the world's largest and most prosperous. East Asia borders North Asia to the north, Southeast Asia to the south, South Asia to the southwest, and Central Asia to the west. To its east is the Pacific Ocean . East Asia has long been a crossroads of civilizations, as

19575-431: The two, jadeite is rarer, documented in fewer than 12 places worldwide. Translucent emerald-green jadeite is the most prized variety, both historically and today. As "quetzal" jade, bright green jadeite from Guatemala was treasured by Mesoamerican cultures, and as "kingfisher" jade, vivid green rocks from Burma became the preferred stone of post-1800 Chinese imperial scholars and rulers. Burma ( Myanmar ) and Guatemala are

19720-454: The volatiles. Diamonds can also form polycrystalline aggregates. There have been attempts to classify them into groups with names such as boart , ballas , stewartite, and framesite, but there is no widely accepted set of criteria. Carbonado, a type in which the diamond grains were sintered (fused without melting by the application of heat and pressure), is black in color and tougher than single crystal diamond. It has never been observed in

19865-428: The word has also come to refer more generally to precious or ornamental stones, and is very common in more symbolic usage as in phrases like 拋磚引玉/抛砖引玉 (lit. "casting a brick (i.e. the speaker's own words) to draw a jade (i.e. pearls of wisdom from the other party)"), 玉容 (a beautiful face; "jade countenance"), and 玉立 (slim and graceful; "jade standing upright"). The character has a similar range of meanings when appearing as

20010-418: The world economy. As of at least 2022, the region is more peaceful, integrated, wealthy, and stable than any time in the previous 150 years. In common usage, the term "East Asia" typically refers to a region including Greater China , Japan , Korea and Mongolia . China , Japan , and Korea represent the three core countries and civilizations of traditional East Asia, as they once had

20155-513: The world stage. With the region having been home to various influential empires, kingdoms, and dynasties throughout history, each leaving its mark on the region and transforming the region's geopolitical landscape ranging from distinct dynastic kingdoms to colonial possessions to independent modern nation-states. East Asia, especially Chinese civilization , is regarded as one of the earliest cradles of civilization . Other ancient civilizations in East Asia that still exist as independent countries in

20300-430: The world's largest diamond deposit, estimated at trillions of carats, and formed by an asteroid impact. A common misconception is that diamonds form from highly compressed coal . Coal is formed from buried prehistoric plants, and most diamonds that have been dated are far older than the first land plants . It is possible that diamonds can form from coal in subduction zones , but diamonds formed in this way are rare, and

20445-535: Was a major site of Austronesian civilisation prior to colonisation by European colonial powers and China from the 17th century onward. For thousands of years, China was the leading civilization in the region, exerting influence on its neighbours. Historically, societies in East Asia have fallen within the Chinese sphere of influence , and East Asian vocabularies and scripts are often derived from Classical Chinese and Chinese script . The Chinese calendar serves as

20590-598: Was a rare and valued material in pre-Columbian Mesoamerica . The only source from which the various indigenous cultures , such as the Olmec and Maya , could obtain jade was located in the Motagua River valley in Guatemala . Jade was largely an elite good, and was usually carved in various ways, whether serving as a medium upon which hieroglyphs were inscribed, or shaped into symbolic figurines . Generally,

20735-569: Was not used. There is a theory that the reason why the meaning is that it was believed that the color of green enables the reproduction of fertility, the life, and the soul of the earth. The use of jade and other greenstone was a long-term tradition in Korea ( c.  850 BC – AD 668). Jade is found in small numbers of pit-houses and burials . The craft production of small comma -shaped and tubular "jades" using materials such as jade, microcline , jasper , etc., in southern Korea originates from

20880-521: Was part of a class of sacred objects that had life. It was not until 1863 that French mineralogist Alexis Damour determined that what was referred to as "jade" could in fact be one of two different minerals , either nephrite or jadeite . Nephrite consists of a microcrystalline interlocking fibrous matrix of the calcium, magnesium-iron rich amphibole mineral series tremolite (calcium-magnesium)-ferroactinolite (calcium-magnesium-iron). The middle member of this series with an intermediate composition

21025-409: Was used for the finest objects and cult figures, and for grave furnishings for high-ranking members of the imperial family. Due to that significance and the rising middle class in China, in 2010 the finest jade when found in nuggets of "mutton fat" jade – so-named for its marbled white consistency – could sell for $ 3,000 an ounce, a tenfold increase from a decade previously. The Chinese character 玉 (yù)

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