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

Set with a rectangular-cut sapphire in a brilliant-cut diamond surround, to the baguette-cut diamond shoulders, ring size 9¼. Estimate CHF5,500 – CHF7,200 ($6,311 - $8,261)

Accompanied by report no. 71839 dated 10 December 2013 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/