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

Set with a cushion-shaped sapphire, weighing approximately 11.62 carats, to the shield-shaped diamond shoulders, mounted in gold, ring size 6¾. Estimate CHF40,000 – CHF50,000 ($45,745 - $57,182)

Accompanied by report no. 72584 dated 5 February 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/