18 karat gold ring, René Boivin, circa 1935

Designed as a large slightly concave disc embellished with a stylized monogram in relief, weighing approximately 46 dwts., size 6¼, maker's mark, French assay mark. Estimate 5,000—7,000 USD

NOTE: Accompanied by a certificate of authenticity from Boivin, dated February 2007, issued by Françoise Cailles.

Sotheby's. Important Jewels. 04 Feb 09. New York www.sothebys.com photo courtesy Sotheby's