A sapphire and diamond ring, by Chaumet. Photo Christie's Image Ltd 2013

Set with a cushion-shaped sapphire, weighing approximately 8.70 carats, to the epaulet-shaped diamond shoulders, ring size 6½, with French assay mark for platinum. With maker’s mark and signed Chaumet Paris. 

Accompanied by report no. 69640 dated 26 August 2013 from the SSEF Swiss Gemmological Institute stating that the sapphire is of Kashmir origin, with no indications of heating

Report no. 13040173 dated 27 April 2013 from the Gübelin GemLab stating that the sapphire is of Kashmir origin, with no indications of heating.

Christie's. MAGNIFICENT JEWELS. 12 November 2013. Geneva - www.christie's.com