Sapphire and diamond ring, M. Gérard, 1970s. Photo Sotheby's.

The cabochon sapphire weighing 22.40 carats, framed with brilliant-cut diamonds, the shoulders set with similarly cut stones, size 51, signed M. Gérard, numbered, French assay and maker's marks, pouch stamped M. Gerard. Estimation 7,500 — 11,000 CHF

Sotheby's. Magnificent Jewels and Noble Jewels, Genève | 13 mai 2014 - http://www.sothebys.com/