An important oval-shaped diamond ring

An important oval-shaped diamond ring. Photo: Christie's Images Ltd., 2010

Set with an oval-shaped diamond weighing 20.54 carats, to the triangular-shaped diamond shoulders, mounted in platinum, size 6 - Estimate CHF1,800,000 - CHF2,500,000 ($1,850,802 - $2,570,558)

Accompanied by report no. 5121644731 dated 29 September 2010 from the GIA Gemological Institute of America stating that the stone is D colour, VVS1 clarity, with Excellent polish and Excellent symmetry

Christie's. Jewels: The Geneva Sale, 17 November 2010. Geneva www.christies.com