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Black jade and diamond necklace, Tiffany & Co. photo Sotheby's

Composed of black jade links, spaced by square-cut diamonds weighing approximately 11.15 carats, mounted in platinum, length 14½ inches, signed Tiffany & Co., numbered 18352737. Est. 10,000—15,000 USD. Lot Sold 23,750 USD

Sotheby's. Important Jewels. 03 Feb 10. New York www.sothebys.com