A Sapphire and diamond ring, by Boucheron. Photo Christie's Image Ltd 2013

Set with an octagonal-cut sapphire, weighing approximately 7.91 carats, to the tapered baguette-cut diamond shoulders, ring size 5½, with French assay mark for gold, in beige suede Boucheron case. Signed Boucheron Paris. 

Accompanied by report no. 12080078 dated 14 August 2012 from the Gübelin Gemlab stating that the sapphire is of Kashmir origin, with no indications of heating

Report no. 64272 dated 26 July 2012 from the SSEF Swiss Gemmological Institute 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