Sapphire and diamond ring. Photo Sotheby's.

The oval sapphire weighing 15.39 carats, set between triangular diamond shoulders, size 51, partial French maker's mark. Estimation 105,000 — 160,000 CHF 

Accompanied by SSEF report no. 72859, stating that the sapphire is of Burmese origin, with no indications of heating. 

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