Lot 72. An important Ceylon 58.00  and 28.51 carats sapphire and diamond necklace, by Cartier. Estimate USD 1,000,000 - USD 1,500,000. Price realised USD 1,152,500 © Christie’s Images Limited 2018.

Suspending a cushion-cut sapphire, weighing approximately 58.00 carats, joined to a cushion-cut sapphire, weighing approximately 28.51 carats, by a modified square-cut diamond, weighing approximately 4.13 carats, to the two-row circular-cut diamond-set navette-shaped link neckchain, accented by square-cut diamonds, 14 ins., with French assay marks for platinum and 18k white gold, in a Cartier red case. Signed Cartier, no. 770836.

Accompanied by report no. 1090790 dated 12 March 2018 from the AGL American Gemological Laboratories stating that it is the opinion of the Laboratory that the origin of this sapphire, weighing approximately 58.00 carats, would be classified as Ceylon (Sri Lanka), with no gemological evidence of heat.