Lot 51. A 13.37 carats Kashmir cushion mixed-cut sapphire and diamond ring. Estimate USD 400,000 - USD 500,000. Price realised USD 547,500 © Christie’s Images Limited 2017.

Set with a cushion mixed-cut sapphire, weighing approximately 13.37 carats, within a circular and marquise-cut diamond cluster surround, ring size 7 1/4, mounted in platinum

Accompanied by report no. 89773 dated 23 January 2017 from the SSEF Swiss Gemmological Institute stating that the sapphire is of Kashmir origin, with no indications of heating 

With report no. CS 1079437 dated 3 November 2016 from the AGL American Gemological Laboratories stating that it is the opinion of the Laboratory that the origin of this sapphire would be classified as Kashmir, with no gemological evidence of heat or clarity enhancement

Christie's. Magnificent Jewels, 26 April 2017, New York, Rockefeller Center