The world’s largest internally flawless diamond, a 303.1-carat fancy deep brownish-yellow stone, sold yesterday for $12.4m at at Sotheby’s New York. It became the third most valuable yellow diamond ever sold at auction, but fell short of its $15m high estimate. Sotheby’s described the price as “strong”. Quig Bruning, head of jewelry for Sotheby’s Americas, […]

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