Lot 36. Diamond ring, René Boivin, 1933-1934. Estimate 29,000 — 39,000 CHF. Lot sold 37,500 CHF. Courtesy Sotheby's

The central circular-cut diamond weighing 5.21 carats, set between fluted shoulders set with circular- and single-cut diamonds, size 48^1/2, French import marks. 

Accompanied by a certificate from Françoise Cailles.

Sotheby's. Magnificent Jewels and Noble Jewels. Genève, 14 mai 2013