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List Of Largest Rough Diamonds
This is a partial list of the largest non-synthetic diamonds with a rough stone (uncut) weight of over 200 carats (40 grams). The list is not intended to be complete – e.g., the Cullinan (formerly Premier) mine alone has produced 135 diamonds larger than 200 carats since mining commenced. De Beers generally does not publish information relating to large diamond discoveries. See also *List of diamonds * List of emeralds by size *List of individual gemstones *List of gold nuggets by size * List of sapphires by size References External links * {{List of precious stones by size * Largest rough diamonds diamonds Diamonds Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Another solid form of carbon known as graphite is the chemically stable form of carbon at room temperature and pressure, bu ... Diamonds, rough ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diamond
Diamond is a Allotropes of carbon, solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Another solid form of carbon known as graphite is the Chemical stability, chemically stable form of carbon at Standard conditions for temperature and pressure, room temperature and pressure, but diamond is metastable and converts to it at a negligible rate under those conditions. Diamond has the highest Scratch hardness, 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 lattice defect, defects or impurities (about one per million of lattice atoms) color diamond blue (bor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lesedi La Rona
Lesedi La Rona, formerly known in media as Karowe AK6 or as Quad 1 by the personnel at the mine, is the fourth-largest diamond ever found, and the third-largest of gem quality. It was found in the Karowe mine, (formerly called AK6) in Botswana on 16November 2015. British jeweller Graff bought the rough diamond for $53 million in 2017. By April 2019, Graff had cut it into one large emerald cut diamond, the Graff Lesedi La Rona, weighing and 66 smaller stones. Description The Lesedi La Rona is a colourless/white, type IIa diamond. It weighs and measures . In comparison, the Cullinan, discovered in 1905 in South Africa, weighed . The Lesedi La Rona was mined using Large Diamond Recovery ("LDR") XRT machines, and is the largest diamond recovered using machines for automated diamond sorting. It is estimated to be over 2.5 billion years old. It was found on 16November 2015, in the South Lobe of the Karowe mine about below the surface, and the find was announced on 18Novem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mbuji-Mayi
Mbuji-Mayi or Mbujimayi (formerly Bakwanga) is a city and the capital of Kasai-Oriental Province in the south-central Democratic Republic of Congo. It is the second largest city in the country, following the capital Kinshasa but ahead of Lubumbashi, Kisangani and Kananga, though the exact population is not known. Estimates ranged from a 2010 ''CIA World Factbook'' estimated population of 1,480,000 to as many as 3,500,000 estimated by the United Nations in 2008. Mbuji-Mayi lies in Luba country on the Mbuji-Mayi River. The name Mbuji-Mayi comes from the local language, Tshiluba, and translates as "Goat-Water," a name deriving from the great number of goats in the region. Despite its large population, the city remains remote, having little connection to surrounding provinces or to Kinshasa and Lubumbashi. However, Mbuji-Mayi is the traditional centre of industrial diamond mining in Congo, with it being located on top of one of the largest known deposits in the world. Air travel is p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Millennium Star
The Millennium Star is a diamond owned by De Beers. At 203.04 carats (40.608 g), it is the world's second largest known top-color (grade D, i.e. colourless), internally and externally flawless, pear-shaped diamond. The diamond was discovered in the Mbuji-Mayi district of Zaire in 1990 in alluvial deposits; uncut, it was 777 carats (155.4 g). It was purchased by De Beers during the height of the country's Civil War that took place in the early to mid-nineties. It took over three years for workers of the Steinmetz Diamond Group to produce the classic pear form. The cutting was done using lasers. It was first displayed in October 1999 as the centerpiece of the De Beers Millennium diamond collection. The collection also includes eleven blue diamonds totalling 118 carats (23.6 g) and The Heart of Eternity. They were displayed at London's Millennium Dome over 2000. There was an attempt on 7 November 2000 to steal the collection (see Millennium Dome raid), b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kollur Mine
Kollur Mine was a series of gravel-clay pits on the south bank of the Krishna River in the Golconda Sultanate of India. It currently falls within the state of Andhra Pradesh. It is thought to have produced many large diamonds, known as Golconda diamonds, several of which are or have been a part of crown jewels. The mine was established in the 16th century and operated until the 19th century. History Kollur Mine operated between the 16th and mid-19th centuries, and was one of the largest and most productive diamond mines on the Indian subcontinent. At the height of production, around 30,000 – 60,000 people worked there, including men, women, and children of all ages. Kollur itself had a population of around 100,000. Golconda mines were owned by the king, but operation was leased to diamond merchants, either foreigners or Indians of the goldsmith caste. As well as rent, the king also received 2% from sales and he was entitled to keep all diamonds weighing over 10 cara ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Koh-i-Noor The Koh-i-Noor ( ; from ), also spelled Kohinoor and Koh-i-Nur, is one of the largest cut diamonds in the world, weighing . It is part of the Crown Jewels of the United Kingdom. The diamond is currently set in the Crown of Queen Elizabeth The Queen Mother. There are multiple conflicting legends on the origin of the diamond. However, in the words of Theo Metcalfe there is 'very meager and imperfect' evidence of the early history of the Koh-i-Noor before the 1740s, that can directly tie it to any ancient diamond. There is no record of its original weight, but the earliest attested weight is 186 old carats (191 metric carats or 38.2 g). The first verifiable record of the diamond comes from a history by Muhammad Kazim Marvi of the 1740s Invasion of Northern India. Marvi notes that the Koh-i-Noor as being one of many stones on the Mughal Peacock Throne that Nader Shah looted from Delhi. The diamond then changed hands between various empires in south and west Asi |
