18 karat two-color gold, abalone, star sapphire and diamond clip-brooch, France. Photo Sotheby's

Designed as an abalone seashell centered by a purple star sapphire measuring approximately 18.8 by 15.1 mm, decorated with round and rose-cut diamonds weighing approximately 1.35 carats, with French assay and workshop marks. Estimation 7,500 — 10,000 USD

Sotheby's. Important Jewels. New York | 06 Feb 2014 - www.sothebys.com