Platinum and diamond ring, Oscar Heyman & Brothers. Photo Sotheby's

The marquise-shaped diamond weighing 9.05 carats, flanked by pear-shaped diamonds weighing approximately 2.70 carats, size 6, maker's mark for Oscar Heyman & Bros, numbered 34821. ESTIMATE 400,000-600,000 USD. Lot Sold: 542,500 USD

Accompanied by GIA report no. 2135557933 stating that the diamond is D color, VVS2 clarity; together with a letter from the GIA stating that the diamond has been determined to be type IIa.

Sotheby's. Magnificent Jewels. New York | 07 Dec 2011 www.sothebys.com