A rectangular-cut fancy vivid yellow diamond ring. Photo: Christie's Images Ltd., 2010

Set with a rectangular-cut fancy vivid yellow diamond weighing 6.53 carats, to the triangular-cut diamond shoulders, mounted in platinum and gold, size 6. Estimate CHF280,000 - CHF350,000 - Price Realized CHF 339,000

Accompanied by report no. 17233470 dated 27 May 2008 from the GIA Gemological Institute of America stating that the diamond is Fancy Vivid Yellow colour, VS1 clarity

A diamond and coloured diamond suite. Photo: Christie's Images Ltd., 2010

Comprising a necklace, the front section set with nine graduated square-cut coloured diamonds with brilliant-cut, marquise and pear-shaped diamond cluster spacers, to the similarly-set back chain, a pair of ear clips en suite, mounted in platinum and gold, necklace 41.0 cm, ear clips 3.0 cm. Estimate CHF 70,000 - CHF 90,000 - Price Realized CHF 303,000

Accompanied by reports no. 57560, 57561 and 57562 dated 4 October 2010 stating respectively that the diamonds weighing 3.03, 3.60 and 5.40 carats are all of natural Fancy Yellow colour (2)

An unmounted coloured diamond. Photo: Christie's Images Ltd., 2010

The cushion-cut fancy yellow diamond weighing 17.74 carats Estimate CHF 180,000 - CHF 220,000 - Price Realized CHF 291,000

Accompanied by report no. 1122526641 dated 7 September 2010 from the GIA Gemological Institute of America stating that the diamond is Fancy Yellow colour, VVS2 clarity; accompanied by a working diagram indicating that the clarity of the diamond may be potentially Internally Flawless

Report no. 081028A/RVH dated 28 October 2008 from the E.G.L. European Gemological Laboratory stating that the diamond is Fancy Yellow colour, VVS1 clarity

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