A large blue diamond, one of the world's rarest, could fetch $35-55 million at auction next week, Sotheby's said on Wednesday, as an industry group reported strong prices for colour diamonds ahead of the holiday season.
Read More: "Once in a blue moon diamond" could fetch up to $55 million -Sotheby's
Read More: "Once in a blue moon diamond" could fetch up to $55 million -Sotheby's
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