A Sotheby's employee shows the world's largest round fancy vivid blue diamond, a 7.59 Carat stone, estimated in excess of £12 million at Sotheby's, central London, during a preview of the auction ... more 
A Sotheby's employee shows the world's largest round fancy vivid blue diamond, a 7.59 Carat stone, estimated in excess of £12 million at Sotheby's, central London, during a preview of the auction house's forthcoming London Rocks sale in October, when two diamonds, the white diamond at 118.28 carats, the largest D colour Flawless diamond, estimated between £18-22 million and round fancy vivid blue diamond are expected to fetch over £30 million between them at the sale. less 
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Mon, Sep 9, 2013 7:12 AM EDT