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  • The 15.10-carat De Beers Cullinan Blue diamond. (photo: Sotheby’s)

‘De Beers Blue' Might Originate from Deep Earth, Says GIA


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 Sothebys Hong Kong back in April.


These blue diamonds are among the rarest of gems,” specialists from GIAs New York laboratory wrote in Gems & GemologyRecent research...has demonstrated that their boron derived from pieces of the earths 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 diamonds 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 worlds most important diamonds.”





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