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Rhodochrosite is a manganese carbonate mineral with chemical composition MnCO 3. In its pure form (rare), it is typically a rose-red colour, [5] but it can also be shades of pink to pale brown. It streaks white, [6] and its Mohs hardness varies between 3.5 and 4.5. Its specific gravity is between 3.45 and 3.6. [7]
One carat is defined as 200 milligrams (about 0.007 ounces avoirdupois). The point unit—equal to one one-hundredth of a carat (0.01 carat, or 2 mg)—is commonly used for diamonds of less than one carat. All else being equal, the price per carat increases with carat weight, since larger diamonds are both rarer and more desirable for use as ...
Herkimer diamonds are double-terminated quartz crystals discovered within exposed outcrops of dolomite in and around Herkimer County, New York, and the Mohawk River Valley in the US. [1][2] They are not diamonds; the "diamond" in their name is due to both their clarity and well formed faces. Because the first discovery sites were in the village ...
In 2008, the Wittelsbach Diamond, a 35.56-carat (7.112 g) blue diamond once belonging to the King of Spain, fetched over US$24 million at a Christie's auction. [58] In May 2009, a 7.03-carat (1.406 g) blue diamond fetched the highest price per carat ever paid for a diamond when it was sold at auction for 10.5 million Swiss francs (6.97 million ...
The pink, cushion-cut, 34.65-carat Princie Diamond used to be part of the Jewels of the Nizams of Hyderabad; it was auctioned in 2013 by Christie's and sold for US$ 39.3 million, which is the highest-recorded auction price for a Golconda diamond and a world record for US$ 1.1 million per carat. [87]
Most expensive pink diamond price per carat ever paid at auction [36] Pink Legacy Fancy vivid pink cut-cornered rectangular-cut diamond of 18.96 carats, purchased by Harry Winston in 2018, formerly owned by the Oppenheimer family. [37] The Condé Diamond: Gifted in 1643 by Louis XII or XIV to the Prince of Condé, Louis de Bourbon [38] The Agra ...
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