The exact value of the diamond is still not known Photo: Small Talks. It is considered to be internally and externally "flawless" -- placing it among the world's most chemically pure, transparent and symmetrical diamonds -- and it belongs to a rare subgroup of diamonds that contain little to no nitrogen. Most diamonds come from 150-250km in the lithosphere. — Oppenheimer Diamond: 253.7: yellow: South Africa: One of the largest gem-quality uncut diamonds in the world, at 253.7 carats (50.74 g). Selling for $71.2 million, it is now the most expensive ring in the world and the most valuable gemstone ever sold at auction. Once completed, the white gold, diamond-encrusted mask will be decorated with more than 3,600 white and black diamonds and be worth $1.5m, the Associated Press reports. Other most expensive gemstones are as follows: Blue Diamond – $3.93 million per carat Musgravite – $35,000 per carat Jadeite – […] It looks luxurious and rich. It remains a premier attraction at the Smithsonian Institution. this one weighing 300.12-carat in its rough. It has a maximum hardness. De Beers Centenary Diamond: $ 100 Millions. Cut from a rough diamond discovered in 2018 in Ontario, Canada, the oval stone received the highest bid placed for a jewel online, nearly $11 million, but eventually went to a telephone bidder in Japan, a private collector who quickly called the stone "Maiko Star" after one of his daughters. The most popular cut for diamond engagement rings is also the priciest. It’s a 105 carat (21.6 grams) diamond that was once the largest known diamond in the world. This same collector purchased a diamond from Sotheby's last year, naming it "Manami Star" after his eldest daughter. At 45.52 carats, the diamond is classified as Fancy Dark Grayish-Blue. The diamond color is rated as fancy vivid Yellow by the Gemological Institute of America. 4). Bidding had been open online for almost three weeks before the sale was concluded at Monday's live auction. The stone, a 102.39-carat D Colour Flawless Oval Diamond… It is a rare Type II diamond for $16.9 million. The Cullinan, $400 million. Top 10 Most Expensive Diamonds in the World. The gem remains the property of the British crown and is kept in HM Tower of London and it’s a popular tourist attraction. This diamond is very rare class of colored diamond. "Diamonds of this caliber attract interest well beyond the traditional pool of collectors," Wong said, adding that the sale would "act as a great indicator of the vitality of the demand. Only seven D color flawless (or internally flawless) diamonds weighing more than 100 carats had ever appeared at auction before Monday's sale, according to Sotheby's. Sotheby's is set to auction off a 102-carat diamond that could become the most expensive jewel ever sold to an online bidder. No one know precisely where the diamond was found. And that the sale is a testament "not just to the importance of this diamond, but to the market for diamonds more broadly. The Moussaieff Red Diamond is 5.11 carats (1.022 g) diamond with triangular brilliant cut that rated as Fancy Red in colour by the Gemologial Institute of America (GIA). The 59.60-carat pink diamond ring features the largest Internally Flawless Fancy Vivid diamond ever graded by the GIA. While Sotheby's had declined to provide a pre-sale estimate, the auction house had been expected to attract huge bids for the item after it achieved top rankings in each of the "four Cs" by which a diamond is judged -- cut, color, clarity and carat weight. 2. The most expensive diamond cut is the round brilliant. The Steinmetz Pink is 59.60 carats (11.92 grams) of diamond that rated as Vivid Pink by the Gemological Institute of America. The Cullinan Diamond is 3,106,75 carats (621.35 grams) diamond and is the largest rough gem quality diamond ever found in the world. 5. This diamond is the 3rd largest diamond has been produced by De Beer’s Premier Mine. The largest rough diamond ever discovered, this white stone was found in magnate Sir Thomas Cullinan’s South African mine in 1905. Patti Wong, the chairman of Sotheby's Asia said in a press release that the "extraordinary gem needed no help from a pre-sale estimate or reserve to reach its rightful price -- just the instinctive desire of collectors to own one of the earth's greatest treasures. As it's so rare and expensive, the exact value is unknown - though it's certainly not something to take into battle with you. It was sold to Chow Tai Fook and was renamed the CTF Pink after the company’s initials. The Sancy diamond is 55.23 carat (11.05 grams) of pale yellow diamond that once was famous as the belonging of the Great Moguls. The stone was from a larger, 271-carat rough diamond discovered at the Victor Mine in Ontario, Canada. Only one to two percent of all diamonds fall into the Type II category. 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