An exceptional 13.88 carats brilliant-cut diamond ring. Photo: Christie's Images Ltd., 2010

Set with a brilliant-cut diamond weighing 13.88 carats, to the pavé-set diamond gallery and hoop, mounted in white gold, size 6½ - Estimate CHF1,600,000 - CHF1,800,000 ($1,645,157 - $1,850,802)

Accompanied by report no. 5111482179 dated 11 December 2009 from the GIA Gemological Institute of America stating that the diamond is E colour, Flawless clarity, with Excellent Cut, Polish and Symmetry

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