Lot 235. An important 23.14 carats square cushion-shaped cabochon Kashmir sapphire and diamond ring. Estimate $800,000 – $1,200,000. Photo Christie's Image Ltd 2016.

Set with a square cushion-shaped cabochon sapphire, weighing approximately 23.14 carats, to the circular-cut diamond shoulders and gallery, ring size 6, mounted in platinum

Accompanied by report no. 83535 dated 8 January 2016 from the SSEF Swiss Gemmological Institute stating that thesapphire is of Kashmir origin, with no indications of treatment, and an Appendix for 'Exceptional Sapphire' indicating that the sapphire '.. exhibits an impressive size and weight of 23.142 ct, combined with an excellent purity'

With report no. CS 72049 dated 11 December 2015 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, also accompanied by an additional letter from AGL attesting to the rarity and desirability of this sapphire

Christie's. MAGNIFICENT JEWELS & THE JUBILEE RUBY, 20 April 2016, New York, Rockefeller Plaza