A 15.05 carats pear-shaped diamond pendant, by Harry Winston

Set with a pear-shaped diamond, weighing approximately 15.05 carats, mounted in platinum. Signed Winston for Harry Winston, with maker's mark for Jacques Timey. Est. $700,000 - $1,000,000

With report 1102355562 dated 23 October 2008 from the Gemological Institute of America stating that the diamond is D color, VVS2 clarity

Accompanied by a supplemental letter stating that the diamond has been determined to be a Type IIa diamond. Type IIa diamonds are the most chemically pure type of diamond and often have exceptional optical transparency. Type IIa diamonds were first identified as originating from India (particularly from the Golconda region) but have since been recovered in all major diamond-producing regions of the world. Among famous gem diamonds, the 530.20 carat Cullinan and the 105.60 carat Koh-i-noor, are examples of Type IIa

Christie's. Jewels: The New York Sale. 22 April 2009. New York, Rockefeller Plaza www.christies.com Photo: Christie's Images Ltd 2009