A two cushion-shaped sapphires 'toi et moi' ring. Photo Christie's Image Ltd 2014

Set with two cushion-shaped sapphires, weighing approximately 16.16 and 15.62 carats, to the plain hoop, mounted in gold, ring size 4½ with ring sizer. Estimate CHF750,000 – CHF1,250,000 ($860,548 - $1,434,246)

Accompanied by report no. 13100239 dated 29 October 2013 from the Gübelin GemLab stating that the 15.62 carat sapphire is of Kashmir origin, with no indications of heating, and an Appendix stating that the sapphire '..possesses a richly saturated and homogeneous colour, combined with a high degree of transparency, and a finely proportioned cut.'

Report no. 73470 dated 17 March 2014 from the SSEF Swiss Gemmological Institute stating that the 15.62 carat sapphire is of Kashmir origin, with no indications of heating and a colour 'that may also be called Royal Blue', and an Appendix letter stating that the '...sapphire exhibits a remarkable size and weight of 15.625 ct combined with an attractive saturated blue colour and a fine purity'

Report no. 13100240 dated 29 October 2013 from the Gübelin GemLab stating that the 16.16 carat sapphire is of Burmese origin, with no indications of heating, and an information sheet on 'Unheated sapphires'

Report no. 73471 dated 17 March 2014 from the SSEF Swiss Gemmological Institute stating that the 16.16 carat sapphire is of Burmese origin, with no indications of heating 

Christie's. GENEVA MAGNIFICENT JEWELS. 14 May 2014, Geneva -http://www.christies.com/