A sensational diamond necklace

Suspending a rectangular-cut diamond, weighing approximately 40.21 carats, from a baguette-cut diamond bail, to the black silk cord, joined by a baguette-cut diamond barrel clasp, mounted in platinum, 16 ins.- Estimate on request
With report 17431451 dated 8 July 2008 from the Gemological Institute of America stating that the diamond is D color, flawless clarity, with excellent polish and excellent symmetry

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 Golcanda 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. 15 October 2008. New York, Rockefeller Plaza - www.christie's;com