The cushion-shaped sapphire, weighing 15.97 carats, within an openwork bombé surround set with four oval-cut diamonds, accented by circular-cut sapphires and brilliant-cut diamonds, diamonds approximately 2.90 carats total, ring size 6½ 

Accompanied by a Gubelin report stating that the 15.97 carat natural sapphire has no indications of thermal treatment and originates from Burma (Myanmar). Report number 1007176, dated 20 July 2010. 

Bonhams. RARE JEWELS & JADEITE, 30 Nov 2016, 15:00 HKT - HONG KONG, ADMIRALTY