Barbara Hutton's jadeite necklace - the finest jadeite necklace in the world - fetched $27.4m, the second highest auction price for any jewel, at Sotheby's in 2014.

Barbara Hutton's jadeite necklace - the finest jadeite necklace in the world - fetched $27.4m, the second highest auction price for any jewel, at Sotheby's in 2014.

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