A coloured diamond ring. Photo Christie's Image Ltd 2014

Set with a fancy intense yellow cushion-shaped diamond, weighing approximately 16.57 carats, to the triangular-cut diamond shoulders, mounted in platinum and gold, ring size 11¾. Estimate CHF250,000 – CHF350,000 ($286,318 - $400,845)

Accompanied by report no. 2155391445 dated 2 May 2013 from the GIA Gemological Institute of America stating that the diamond is Fancy Intense Yellow colour, VVS2 clarity

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