|
Premier Rose Diamond
The Premier Rose Diamond () was one of the large rare gems produced by Premier Mine, of De Beers in South Africa. History The Premier Rose Diamond was mined in March 1978. It was purchased by Mouw Diamond Cutting in Johannesburg through a partnership with William Goldberg of New York City. The diamond was marked for bisection by Rose Mouw, the spouse of Jacob Mouw, the founder of Mouw Diamond Cutting. Cutting Frans Swanepoel was responsible for the sawing of the diamond and the cleaving of the lesser half of the diamond was done by Sylvain Mouw and Jacques Mouw. Marcel Cilliers Smulders was the apprentice who assisted with the cutting. The polishing of the two main diamonds of 137.02 (Big Rose) and 31.48 (Little Rose) ct. was done by David du Plessis (who was also responsible for polishing The Golden Jubilee and was one of the main polishers of the Centenary Diamond), and the Baby Rose was done by Mike Botha and Willem Joubert. The stones resulting from the original stone ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Premier Mine
The Premier Mine is an underground diamond mine owned by Petra Diamonds in the town of Cullinan, Gauteng, Cullinan, east of Pretoria, Gauteng Province, South Africa. Established in 1902, it was renamed the Cullinan Diamond Mine in November 2003 in celebration of its centenary. The mine is a carrot-shaped volcanic pipe and has a surface area of . The mine rose to prominence in 1905, when the Cullinan Diamond – the largest rough diamond of gem quality ever found – was discovered there. The mine has produced over 750 stones that are greater than and more than a quarter of all the world's diamonds that are greater than . It is also the only significant source of blue diamonds in the world. Notable discoveries The Cullinan Diamond is the largest rough gem-quality diamond ever found, at . It was found by Frederick Wells, surface manager of the Premier Diamond Mining Company in Cullinan, Gauteng, South Africa, on 25 January 1905. The stone was named after Sir Thomas Cullina ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Africa
South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countries of Namibia, Botswana, and Zimbabwe; and to the east and northeast by Mozambique and Eswatini. It also completely enclaves the country Lesotho. It is the southernmost country on the mainland of the Old World, and the second-most populous country located entirely south of the equator, after Tanzania. South Africa is a biodiversity hotspot, with unique biomes, plant and animal life. With over 60 million people, the country is the world's 24th-most populous nation and covers an area of . South Africa has three capital cities, with the executive, judicial and legislative branches of government based in Pretoria, Bloemfontein, and Cape Town respectively. The largest city is Johannesburg. About 80% of the population are Black Sou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
De Beers
De Beers Group is an international corporation that specializes in diamond mining, diamond exploitation, diamond retail, diamond trading and industrial diamond manufacturing sectors. The company is active in open-pit, large-scale alluvial and coastal mining. It operates in 35 countries and mining takes place in Botswana, Namibia, South Africa, Canada and Australia. From its inception in 1888 until the start of the 21st century, De Beers controlled 80% to 85% of rough diamond distribution and was considered a monopoly. Competition has since dismantled the complete monopoly; the De Beers Group now sells approximately 29.5% of the world's rough diamond production by value through its global sightholder and auction sales businesses. The company was founded in 1888 by British businessman Cecil Rhodes, who was financed by the South African diamond magnate Alfred Beit and the London-based N M Rothschild & Sons bank. In 1926, Ernest Oppenheimer, a German immigrant to Britain and l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
As Of
An effective date or as of date is the date upon which something is considered to take effect, which may be a past, present or future date. This may be different from the date upon which the event occurs or is recorded. See also *Coming into force *Official birthday *Vacatio legis ''Vacatio legis'' ( la, absence of law) is a technical term in law which designates the period between the announcement of a legislation and its entering into force. This concept also exists in the Catholic canon law.Fernando della Rocca, "Manua ... References Common law legal terminology {{database-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mouw Diamond Cutting
Mouw is a Dutch surname. Notable people with the surname include: *Johan Andreas Dèr Mouw (1863–1919), Dutch poet and philosopher * Richard Mouw (born 1940), American theologian and philosopher See also *Mow (surname) Mow is a Chinese surname shared by several notable people. * Pang Tzu Mow, 毛邦初, (1904–1987), Chinese, Lt. General of the Republic of China Air Force * William C. W. Mow, 毛昭寰, (born 1936), Chinese-American, entrepreneur and founde ... {{Surname Dutch-language surnames ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johannesburg
Johannesburg ( , , ; Zulu language, Zulu and xh, eGoli ), colloquially known as Jozi, Joburg, or "The City of Gold", is the largest city in South Africa, classified as a Megacity#List of megacities, megacity, and is List of urban areas by population, one of the 100 largest urban areas in the world. According to Demographia, the Johannesburg–Pretoria urban area (combined because of strong transport links that make commuting feasible) is the 26th-largest in the world in terms of population, with 14,167,000 inhabitants. It is the provinces of South Africa, provincial capital and largest city of Gauteng, which is the wealthiest province in South Africa. Johannesburg is the seat of the Constitutional Court of South Africa, Constitutional Court, the highest court in South Africa. Most of the major South African companies and banks have their head offices in Johannesburg. The city is located in the mineral-rich Witwatersrand range of hills and is the centre of large-scale gold and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Goldberg (diamond Dealer)
William Goldberg (March 19, 1925 – October 20, 2003) was an American diamond dealer and the founder of the William Goldberg Diamond Corporation. Goldberg was born in Brooklyn, New York City. He started cutting diamonds in 1948, but found that his aptitude lay with buying and selling diamonds rather than cutting them. In 1952 he founded Goldberg & Weiss with diamond cutter Irving Weiss. In 1973 he formed the William Goldberg Diamond Corporation, located on 48th Street in New York City's Diamond District. In 1978 he became president of the New York Diamond Dealers Club and served three terms. He traded well known diamonds including the Queen of Holland diamond, the Premier Rose diamond, the Red Shield diamond and the Pumpkin diamond. He died of pancreatic cancer, aged 77. Following his death, members of Goldberg's family created the William Goldberg Endowed Scholarship Fund at the Gemological Institute of America The Gemological Institute of America (GIA) is a nonp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Golden Jubilee Diamond
The Golden Jubilee Diamond, a 545.67 Carat (unit), carat (109.13 g) brown diamond, is the largest cut and faceted diamond in the world. It outweighs the Cullinan Diamond, Cullinan I by 15.37 carats (3.07 g). The Golden Jubilee Diamond was discovered in 1985 at the Premier Mine, which is also the origin of the Cullinan diamond (1905) and other notables such as the Taylor–Burton Diamond, Taylor–Burton (1966) and the Centenary Diamond, Centenary (1986). Cullinan I, also known as the Great Star of Africa, had held the title of the largest cut and faceted diamond since 1908. History First known as the "Unnamed Brown", the Golden Jubilee Diamond was cut from a large Brown diamonds, brown diamond of 755.5 carats (151 g), found in the prolific blue ground of the Premier Mine in South Africa in 1985. Until 1990, the diamond remained largely unknown to the outside world, requiring two years' work to bring it to its current state. A large surface and deep cracks from the interior, as w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centenary Diamond
The De Beers Centenary Diamond is, at , the third-largest diamond to have been produced in the Premier Mine. Among top-color diamonds, only the Cullinan I and II are larger than the Centenary diamond. The Centenary Diamond is rated in color as grade D color by the Gemological Institute of America, which is the highest grade of colourless diamond and is internally and externally flawless. It was named the Centenary Diamond as it was presented in the rough for the Centennial Celebration of De Beers Consolidated Mines on 11 May 1988. The Centenary Diamond was unveiled in final form in May 1991. Discovery The Centenary Diamond was discovered in the Premier Mine on 17 July 1986 using their X-ray imaging system. The original rough was and it was presented on 11 May 1988 in the Centennial Celebration of the De Beers Consolidated Mines. As then-chairman Julian Ogilvie Thompson said, "We have recovered at the Premier Mine a diamond of which is perfect in colour – indeed it is on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mike Botha
Mike Botha is a master diamond cutter, with more than five decades in the profession. His training and subsequent career began in South Africa and has led him to Mauritius, Russia and Canada and from Vancouver to the Northwest Territories and Saskatchewan. Biography Michiel Josias "Mike" Botha (born 1947) is engaged in diamond design, cutting and polishing in North America. Trained under David du Plessis, he received his cross-working apprenticeship diploma in 1970 in South Africa. He has also worked as the occupational certification officer for the diamond industry in the Northwest Territories under the Department of Education, Culture and Employment, and was also the technical consultant for the Department of Industry, Tourism and Investment for their Government Diamond Certification Program. Botha led the Diamond Training Program at Aurora College in Yellowknife. During his six-year tenure with Aurora College, he developed and delivered programs, earning the college the Yves Land ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crystallography
Crystallography is the experimental science of determining the arrangement of atoms in crystalline solids. Crystallography is a fundamental subject in the fields of materials science and solid-state physics (condensed matter physics). The word "crystallography" is derived from the Greek word κρύσταλλος (''krystallos'') "clear ice, rock-crystal", with its meaning extending to all solids with some degree of transparency, and γράφειν (''graphein'') "to write". In July 2012, the United Nations recognised the importance of the science of crystallography by proclaiming that 2014 would be the International Year of Crystallography. denote a direction vector (in real space). * Coordinates in ''angle brackets'' or ''chevrons'' such as <100> denote a ''family'' of directions which are related by symmetry operations. In the cubic crystal system for example, would mean 00 10 01/nowiki> or the negative of any of those directions. * Miller indices in ''parentheses ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kimberlite
Kimberlite is an igneous rock and a rare variant of peridotite. It is most commonly known to be the main host matrix for diamonds. It is named after the town of Kimberley in South Africa, where the discovery of an diamond called the Star of South Africa in 1869 spawned a diamond rush and the digging of the open-pit mine called the Big Hole. Previously, the term kimberlite has been applied to olivine lamproites as Kimberlite II, however this has been in error. Kimberlite occurs in the Earth's crust in vertical structures known as kimberlite pipes, as well as igneous dykes. Kimberlite also occurs as horizontal sills. Kimberlite pipes are the most important source of mined diamonds today. The consensus on kimberlites is that they are formed deep within the mantle. Formation occurs at depths between , potentially from anomalously enriched exotic mantle compositions, and they are erupted rapidly and violently, often with considerable carbon dioxide and other volatile componen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
