Freshwater pearl, coral, enamel and diamond brooch. Photo Sotheby's

Designed as a swan, the body composed of a freshwater pearl enhanced with brilliant-cut diamonds, accented with enamel, coral and seed pearls. Estimate 3,500 — 4,500 GBP

Accompanied by a report from The Gem & Pearl Laboratory, stating that the pearl is natural, freshwater.

Sotheby's. Fine Jewels. London | 26 Mar 2014, 10:00 AM - www.sothebys.com