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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.
The diamond now known as the Sancy began as an even larger diamond called the Balle de Flandres with a possible weight of over 100 carats (20 g). [1] The Balle was part of the dowry of Valentina Visconti when she married Louis I, Duke of Orléans (the younger brother of King Charles VI of France ) in 1398.
In 2006, the company announced that it had found a diamond of 603 carats (120.6 g) at the Letseng diamond mine in Lesotho, which became known as the Lesotho Promise. [8]In January 2018, a larger stone was discovered at Letseng, measuring 910 carats (182 g) — the fifth-largest gem-quality diamond ever found.
Neither of these changes makes the diamond appear any larger, and both greatly reduce the sparkle of the diamond. (A poorly cut 1.0-carat (200 mg) diamond may have the same diameter and appear as large as a 0.85-carat (170 mg) diamond.) The depth percentage is the overall quickest indication of the quality of the cut of a round brilliant ...
The Florentine Diamond is a lost diamond of Indian origin. It is light yellow in colour with very slight green overtones. It is light yellow in colour with very slight green overtones. It is cut in the form of an irregular (although very intricate) nine-sided 126-facet double rose cut, with a weight of 137.27 carats (27.454 g).
In comparison, the Cullinan, discovered in 1905 in South Africa, weighed 621.4 g (3,106.75 carats). [5] [6] The Lesedi La Rona was mined using Large Diamond Recovery ("LDR") XRT machines, [4] and is the largest diamond recovered using machines for automated diamond sorting. [3] [7] It is estimated to be over 2.5 billion years old. [8]
The Jones Diamond, also known as the Punch Jones Diamond, The Grover Jones Diamond, or The Horseshoe Diamond, was a 34.48 carat (6.896 g) alluvial diamond found in Peterstown, West Virginia by members of the Jones family. It remains the largest alluvial diamond ever discovered in North America.
In 1996 the largest diamond found at the mine was discovered. Named the "Colorado Diamond," it was a 28.3-carat (5.66 g) yellow stone and the fifth-largest diamond found in North America. The gem was cut and polished by legendary New York diamond cutter Bill Goldberg which yielded a 5.39-carat (1.078 g) faceted stone that sold for $87,500. [5] [16]