The largest vivid blue diamond ever sold at auction has fetched a staggering £39million.The 15.10 carat De Beers Blue diamond became one of the most valuable diamonds ever to be offered at auction after going on sale with Sotheby's today. The stone, which sold for £2million over its estimated price after seven minutes of bidding, is the biggest step cut vivid blue diamond ever to be graded by the Gemological Institute of America.
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