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Petra Diamonds
Petra Diamonds Ltd is a diamond mining group headquartered in Jersey. Petra own one of the world's most productive mines historically, the Premier Mine, Cullinan Diamond Mine is famed for having produced the Cullinan Diamond, world's largest rough and polished diamond. The company is listed on the London Stock Exchange. History Petra Diamonds was founded by Adonis Pouroulis in 1997 and was first listed on the Alternative Investment Market later that year. It transferred to the Main Market in December 2011. Operations Petra Diamonds' operations are focused in Africa: South Africa Petra Diamonds operates three producing diamond mines in South Africa. These are all underground kimberlite pipe mines (Cullinan, Finsch and Koffiefontein). Finsch Mine Finsch diamond mine is one of the world's most important diamond mines and South Africa's second largest diamond operation by production. On 14 September 2011, Petra purchased Finsch as a fully staffed, operating mine from D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public Company
A public company is a company whose ownership is organized via shares of stock which are intended to be freely traded on a stock exchange or in over-the-counter markets. A public (publicly traded) company can be listed on a stock exchange (listed company), which facilitates the trade of shares, or not (unlisted public company). In some jurisdictions, public companies over a certain size must be listed on an exchange. In most cases, public companies are ''private'' enterprises in the ''private'' sector, and "public" emphasizes their reporting and trading on the public markets. Public companies are formed within the legal systems of particular states, and therefore have associations and formal designations which are distinct and separate in the polity in which they reside. In the United States, for example, a public company is usually a type of corporation (though a corporation need not be a public company), in the United Kingdom it is usually a public limited company (plc), i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward VII
Edward VII (Albert Edward; 9 November 1841 – 6 May 1910) was King of the United Kingdom of Great Britain and Ireland and Emperor of India, from 22 January 1901 until his death in 1910. The second child and eldest son of Queen Victoria and Prince Albert of Saxe-Coburg and Gotha, and nicknamed "Bertie", Edward was related to royalty throughout Europe. He was Prince of Wales and heir apparent to the British throne for almost 60 years. During the long reign of his mother, he was largely excluded from political influence and came to personify the fashionable, leisured elite. He travelled throughout Britain performing ceremonial public duties and represented Britain on visits abroad. His tours of North America in 1860 and of the Indian subcontinent in 1875 proved popular successes, but despite public approval, his reputation as a playboy prince soured his relationship with his mother. As king, Edward played a role in the modernisation of the British Home Fleet and the reorganis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Williamson Pink Diamond
The Williamson pink diamond is a flawless pink diamond discovered at the Williamson diamond mine in Tanganyika in 1947. The owner of the mine, Canadian geologist John Williamson gave the uncut stone to Princess Elizabeth and Prince Philip upon their wedding in November 1947. The rough diamond was cut by London diamond cutters Briefel and Lemer in 1948, and Cartier was commissioned to create a setting for the main round brilliant cut diamond. The pink diamond became the main feature of a brooch designed by Frederick Mew of Cartier in 1952, forming the centre of a flower with five petals, with white diamonds forming the petals and white baguette cut diamonds as the stalk. The Williamson pink diamond may be the inspiration for the Pink Panther diamond in the 1963 film ''The Pink Panther'' (although another alternative is the ancient Persian pink diamond, the Darya-ye Noor). See also * List of diamonds Diamonds become famous typically for some combination of their size ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elizabeth II
Elizabeth II (Elizabeth Alexandra Mary; 21 April 1926 – 8 September 2022) was Queen of the United Kingdom and other Commonwealth realms from 6 February 1952 until her death in 2022. She was queen regnant of 32 sovereign states during her lifetime, and was head of state of 15 realms at the time of her death. Her reign of 70 years and 214 days was the longest of any British monarch and the longest verified reign of any female monarch in history. Elizabeth was born in Mayfair, London, as the first child of the Duke and Duchess of York (later King George VI and Queen Elizabeth The Queen Mother). Her father acceded to the throne in 1936 upon the abdication of his brother Edward VIII, making the ten-year-old Princess Elizabeth the heir presumptive. She was educated privately at home and began to undertake public duties during the Second World War, serving in the Auxiliary Territorial Service. In November 1947, she married Philip Mountbatten, a former prince ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Williamson (geologist)
John Thoburn Williamson (1907 –1958) was a Canadian geologist famous for establishing the Williamson diamond mine in present-day Tanzania. Early life Williamson was born in 1907 in Montfort, Quebec. He attended McGill University, where he initially intended to study law, but became interested in geology after accompanying a friend on a summer field expedition to Labrador. He subsequently earned bachelor's, master's, and Ph.D. degrees in geology, completing his studies between 1928 and 1933."Three legends to join the Canadian Mining Hall of Fame," ''The Northern Miner'', V. 96, No. 40, November 22–28, 2010, 5. Williamson mine After completing his studies, Williamson travelled to South Africa with one of his professors, where he eventually took a job with Loangwa Concessions, a De Beers subsidiary in what was then Northern Rhodesia (now Zambia). He then moved on to work at the Mabuki diamond mine, which he purchased from the owners in 1936 when they had decided to shut th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pink Diamond
Pink diamond is a type of diamond that has pink color. The source of their pink color is greatly debated in the gemological world but it is most commonly attributed to plastic deformation that these diamonds undergo during their formation. Pink diamonds belong to a subcategory of diamonds called color diamonds, the generic name for all diamonds that exhibit any sort of color. Pink diamonds range from flawless to included, as do white diamonds. Origin of the pink color Numerous theories have been posited as to how the pink is formed in pink diamonds. The prevailing theory is that the pink is caused when the diamond is subjected to shear pressure during its formation. A similar theory is being tested on pink diamonds that originated in the Argyle Mine in Kimberley, Western Australia. This theory posits that a seismic shock propelled colorless diamonds to the surface and altered their molecular structure, causing them to appear pink. Properties determining value The same four bas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Williamson Diamond Mine
The Williamson Diamond Mine (also known as the Mwadui mine) is a diamond mine northeast of Shinyanga in Tanzania; it became well known as the first significant diamond mine outside of South Africa. The mine was established in 1940 by Dr. John Williamson, a Canadian geologist, and has been continuous operation since then, making it one of the oldest continuously operating diamond mines in the world. Over its lifetime it has produced over 19 million carats (3,800 kg) of diamonds. A 2020 report by ''The Guardian'' said that high-quality pink diamonds from the mine could value up to $700,000 a carat. The Williamson mine was once owned by its namesake Dr. Williamson and later nationalized by the government of Tanzania. Since February 2009 the mine is mostly owned by Petra Diamonds, with 75% ownership, the government of Tanzania owning the remaining 25%. In 2020, the mine came under scrutiny because of alleged human rights violations. Description The Williamson diamond mine is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Koffiefontein Mine
Koffiefontein Mine is a diamond mine situated in the Free State province, about 80 km from Kimberley, South Africa. It is one of the many Kimberley mines of which Kimberley mine, de Beers mine, Dutoitspan, Bultfontein and Wesselton are its more famous neighbours. The mine was opened in 1870 and consisted of 1200 claims and worked at a large scale in the beginning of the century. However several sources quote it to have a poor yield: 4 to 5 carat (800 to 1000 mg) in 100 loadsDiamond yield and quality of Koffiefontein Diamond mine by Gardner F. Williams "History of Diamond Mines in South Africa" former De Beers general manager and according to Streeter the mines were not profitable at all by the end of the 19th century. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graff Diamonds
Graff is a British multinational jeweller based in London. It was founded by British jeweller Laurence Graff in 1960. A vertically integrated company, Graff operations comprise the design, manufacture and retail distribution of jewellery and watches. History Graff was founded in London in 1960 by Laurence Graff. Awards Graff were the first ever jewellers to receive the Queen's Award for Industry and Export (now known as the Queen's Award for Enterprise), awarded in 1973. Since then, the company has received this award a further four times, most recently in 2014. The Queen's Award to Industry and Export award is considered to be the highest accolade for a British company. It is awarded on the advice of the Prime Minister, following thorough examinations of each application by an Advisory Committee formed of leading representatives of industry and commerce. Sourcing Graff adheres to the Kimberley Process, never knowingly buying or trading rough diamonds from areas where this woul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gem Diamonds
Gem Diamonds is a British-based global diamond mining business. It is headquartered in London and is listed on the London Stock Exchange. In 2017, the company generated a profit of $20.8 million. History The business was founded by Clifford Elphick in July 2005. The company acquired Letšeng diamond mine in 2006, and has since found five of the 20 largest known white gem quality diamonds, elevating the mine to the highest dollar-per-carat kimberlite diamond operation in the world.Jamasmie, Cecilia "Gem Diamonds shares on fire as miner finds 910-carat rock", ''Mining.com'', January 15, 2018. Retrieved March 14, 2018. The company was first listed on the |
Chow Tai Fook Jewellery
Chow Tai Fook group is a Hong Kong–based, privately-owned conglomerate with holdings in the jewellery, property development, hotel, department store, transportation, energy, telecommunications, port, casino, and other businesses. Despite the holding companies of the group, namely Chow Tai Fook Capital Limited, Chow Tai Fook (Holding) Limited, Chow Tai Fook Enterprises Limited, etc. being privately owned, the group has been partially listed on the stock market via associate company New World Development (, listed since 1972) and subsidiary Chow Tai Fook Jewellery Group Limited (, listed since 2011). As of 31 December 2018, New World Development was ranked as the 47th-largest company by market capitalization on the Stock Exchange of Hong Kong, which was HK$105.68061 billion. However, the size of the unlisted portion of the Chow Tai Fook business empire is unclear. The ''Financial Times'' quoted one banker of the Cheng Yu-tung family, who said, "You can't look at hengYT wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uncut Diamond
Diamond cutting is the practice of shaping a diamond from a rough stone into a faceted gem. Cutting diamonds requires specialized knowledge, tools, equipment, and techniques because of its extreme difficulty. The first guild of diamond cutters and polishers (Diamantaire) was formed in 1375 in Nuremberg, Germany, and led to the development of various types of "cut". This has two meanings in relation to diamonds. The first is the shape: square, oval, and so on. The second relates to the specific quality of cut within the shape, and the quality and price will vary greatly based on the cut quality. Since diamonds are one of the hardest materials, special diamond-coated surfaces are used to grind the diamond down. The first major development in diamond cutting came with the "Point Cut" during the later half of the 14th century: the Point Cut follows the natural shape of an octahedral rough diamond crystal, eliminating some waste in the cutting process. Diamond cutting, as well as overa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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