The ‘De Beers Blue’, originally named the ‘De Beers Cullinan Blue’, might originate in the deepest parts of the earth, according to researchers at the Gemological Institute of America (GIA).
This step cut, 15.10-carat, fancy-vivid-blue rare diamond was recently sent to GIA for grading. The rough was unearthed from the Cullinan mine in South Africa, from which Petra Diamonds extracted a 39.34-carat stone. The diamond sold for HKD 450.9 million ($57.5 million) at Sotheby’s Hong Kong back in April.
“These blue diamonds are among the rarest of gems,” specialists from GIA’s New York laboratory wrote in Gems & Gemology. “Recent research...has demonstrated that their boron derived from pieces of the earth’s crust sinking to the extremely deep depths of diamond formation. The gemological characteristics of the De Beers Cullinan Blue suggest it is one of these super-deep diamonds.”
The diamond’s combination of weight, colour and clarity — plus its step cut, which does not enhance colour — is “exceptionally rare,” they concluded. “It will remain one of the world’s most important diamonds.”
08/09/2022
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