A 10.06 carats pear-shaped diamond ring. Photo: Christie's Images Ltd., 2010

Set with a pear-shaped diamond weighing 10.06 carats, to the plain hoop, mounted in white gold, size 6¼ - Estimate CHF950,000 - CHF1,200,000 ($976,812 - $1,233,868)

Accompanied by report no. 5111226404 dated 5 October 2009 from the GIA Gemological Institute of America stating that the diamond is D colour, Internally Flawless clarity, with Excellent polish and Excellent symmetry

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