On October 7, an enormous 118.28-carat D-flawless diamond nearly the size of a small chicken egg—the largest D-flawless diamond ever to appear at auction—and a 7.59-carat internally flawless vivid Premier Blue Diamond, the largest round vivid-blue diamond to be sold at an auction will be auctioned by Sotheby’s.
The white diamond which was discovered in 2011 as a 299-carat piece of rough in a southern African mine is estimated to fetch between $28 million and $35 million.
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The Premier Blue Diamond, believed to be from the Premier Mine (now known as the Cullinan Mine) in Gauteng, South Africa is expected to sell for more than $19 million. A 3,106-carat colorless Cullinan diamond was also pulled from this mine in 1905. This mine has been the only major source of blue diamonds in the last century.