10.50 carats Diamond ring, Harry Winston

Claw-set at the centre with a pear-shaped diamond weighing 10.50 carats, flanked by similarly shaped diamonds, mounted in platinum, signed Winston. size 55, sizing band, Estimate 885,000—1,120,000 CHF- Lot sold 1,034,500 CHF

Accompanied by GIA report no. 5101112140 stating that the diamond is D Colour, VVS1 Clarity. Together with a diamond type classification report stating that the diamond is a type IIa diamond.

'Type IIa diamonds are the most chemically pure type of diamond and often have an exceptional optical transparency.'

Sotheby's. Magnificent Jewels. 19 Nov 08. Geneva. Photo courtesy Sotheby's. www.sothebys.com