Lot 174. A rare twin-stone 5.10 carats Kashmir unheated sapphire and 2.50 carats, I color, VS1 clarity diamond ring, by Bulgari. Estimate USD 300,000 - USD 500,000. © Christie’s Images Limited 2018.

Of crossover design, set with a pear-shaped sapphire, weighing approximately 5.10 carats, and a modified pear brilliant-cut diamond, weighing approximately 2.50 carats, flanked by a tapered baguette and baguette-cut diamond scroll, ring size 4 1/2, mounted in platinum. Signed Bulgari (partially indistinct).

Accompanied by report no. 18022047 dated 27 February 2018 from the Gübelin GemLabstating that the origin of this sapphire would be classified as Kashmir, with no indications of heating; accompanied by an information sheet on 'Unheated Sapphires' 

With report no. 1085910 dated 14 December 2017 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