Sapphire and diamond ring. Photo Sotheby's

Claw-set with a step-cut sapphire weighing 12.67 carats, within a frame of pear-shaped diamonds, size Q. Estimation 8,000 — 12,000 GBP. Lot. Vendu 12,750 GBP 

Accompanied by the Gemmological Institute of India report no. ORG-1201762-001, stating that the sapphire if of Ceylon origin, with no indication of thermal enhancement.

Sotheby's. Fine Jewels. London | 12 déc. 2013. www.sothebys.com