A sapphire and diamond ring. Photo Christie's Image Ltd 2014

Set with an octagonal-cut sapphire, weighing approximately 32.12 carats, to the triangular-cut diamond shoulders, mounted in gold, ring size 8½. Estimate CHF250,000 – CHF350,000 ($286,849 - $401,589)

Accompanied by report no. 73512 dated 17 March 2014 from the SSEF Swiss Gemmological Institute stating that the sapphire is of Ceylon origin, with no indications of heating

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