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

Set with a cushion-shaped sapphire, weighing approximately 25.47 carats, to the brilliant and baguette-cut diamond base, ring size 6¾. Estimate CHF36,000 – CHF54,000 ($41,059 - $61,589)

Accompanied by report no. 73615 dated 20 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/