Two 18 karat white gold, diamond, mother-of-pear and  rock crystal 'Nautilius' brooches, Vhernier. Photo Sotheby's

Designed as carved rock crystal shells backed by mother-of-pearl accented by blue or orange patterns, set with round diamonds weighing approximately 1.40 carats, signed Vhernier. Estimate 10,000-15,000 USD

Sotheby's. Important Jewels. New York | 09 Feb 2012 www.sothebys.com