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.

118 carat white diamond

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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Premier Blue Diamond

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.