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Platinum, Sapphire and Diamond Necklace, Oscar Heyman & Brothers. Estimation 350,000450,000 USD. Photo Sotheby’s

Of graduated design set with 29 oval and cushion-cut sapphires, the three largest sapphires weighing 15.30, 10.33 and 10.16 carats, the remaining sapphires weighing approximately 106.00 carats, spaced by baguette diamonds weighing approximately 6.80 carats, length 15½ inches, numbered 85507, with maker’s mark; fitted with a pendant hoop.

Accompanied by AGL report no. CS 64297 stating that an excess of 50% of the sapphires tested at random are of Ceylon origin, with no indications of heating.

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Sketch of lot 399, Courtesy of Oscar Heyman & Brothers

Sotheby’s. Magnificent Jewels. New York | 09 déc. 2014, 10:00 AM