A 8.64 carats Kashmir sapphire and diamond ring. Estimate CHF300,000 – CHF400,000 ($325,931 - $434,575). Photo Christie's Image Ltd 2015.

Set with an octagonal-cut sapphire, weighing approximately 8.64 carats, to the baguette-cut diamond shoulders, ring size 6, with French assay mark for platinum

Accompanied by report no. 14120152 dated 19 December 2014 from the Gübelin GemLab stating that the sapphire is of Kashmir origin, with no indications of heating, and an Appendix on 'Unheated Sapphires'

Report no. 77532 dated 25 November 2014 from the SSEF Swiss Gemmological Institute stating that the sapphire is of Kashmir origin, with no indications of heating, stating that 'the colour of this sapphire may also be called 'Royal Blue' in the trade' 

Christie's. MAGNIFICENT JEWELS, 13 May 2015, Geneva