Lot 190. A 28.57 carats Ceylon sapphire and diamond ring. Estimate USD 300,000 - USD 500,000. © Christie’s Images Limited 2018.

Set with a cushion-cut sapphire, weighing approximately 28.57 carats, within a circular-cut diamond surround, gallery and half-hoop, the gallery accented by single-cut sapphires, ring size 6 1/2, mounted in platinum.

Accompanied by report no. 1090773 dated 27 February 2018 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 Ceylon (Sri Lanka), with no gemological evidence of heat or clarity enhancement.