18 karat white gold, sapphire, diamond, rock crystal and enamel brooch, René Boivin, France. Photo Sotheby's

Of geometric design, centering a row of six cushion-cut multi-colored sapphires weighing approximately 10.90 carats, flanked by rows set with old mine, old European and single-cut diamonds weighing approximately 1.50 carats, further accented by bands applied with black enamel, the sides set with two lunette-shapped rock crystal tablets, signed R. Boivin, Paris, with French import marks; circa 1930. Estimate 40,000 — 60,000 USD

Literature: Illustrated in Art Deco Jewelry by Sylvie Raulet, page 131.

Sotheby's. Magnificent Jewels, New York | 29 Apr 2014 - www.sothebys.com