A pair of 10.17 carats Square-cut Diamonds Ear Pendants. Photo: Christie's Images Ltd., 2010

The two square-cut diamonds each weighing 10.17 carats, suspended from a line of baguette-cut diamonds, to the diamond-set hook, mounted in platinum, 3.8 cm - Estimate CHF700,000 - CHF900,000 ($719,756 - $925,401)

Accompanied by report no. 2115322788 dated 29 October 2009 from the GIA Gemological Institute of America stating that the 10.17 carats is G colour, VS1 clarity

Report no. 2115322796 dated 21 April 2010 from the GIA Gemological Institute of America stating that the 10.17 carats diamond is H colour, VS1 clarity

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