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

Set with a cushion-shaped ruby, weighing approximately 3.16 carats, to the marquise-shaped diamond surround, mounted in gold, ring size 7½. Estimate CHF25,000 – CHF35,000 ($28,514 - $39,919)

Accompanied by report no. 71407 dated 17 October 2013 from the SSEF Swiss Gemmological Institute stating that the ruby is of Burmese origin, with no indications of heating

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