Lot 304. 7.04 carats Colombian emerald, sapphire, rock crystal and diamond ring, René Boivin, 1991. Estimate 44,000 — 53,000 CHF. Lot sold 131,250 CHF. Photo Sotheby's

Set with a sugarloaf emerald stated to weigh 7.04 carats, between pear-shaped cabochon sapphires and framed with brilliant-cut diamonds, the mount composed of rock crystal, size 481/2. 

Accompanied by SSEF report no. 84043, stating that the emerald is of Colombian origin, with no indications of clarity modification; together with a copy of the original invoice.

Literature: Cf.: Françoise Cailles, René Boivin Joaillier, Paris, 1994, pg. 386 for a picture of the ring.  

Sotheby's. Magnificent Jewels and Noble Jewels, Geneva, 17 May 2016, 10:00 AM