Lot 218. A superb 15.87 carats Type IIa diamond pendant necklace. Estimate USD 1,600,000 - USD 2,000,000. Price realised USD 1,867,500. © Christie’s Images Limited 2017.

Suspending a heart brilliant-cut diamond, weighing approximately 15.87 carats, to the finelink neckchain, 16 1/2 ins., mounted in platinum.

Accompanied by report no. 1152190966 dated 25 March 2016 from the GIA Gemological Institute of America stating that the diamond is D color, Internally Flawless clarity, with excellent polish and symmetry.

With a supplemental letter from the Gemological Institute of America 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 I and the 105.60 carat Koh-i-noor, are examples of Type IIa.

Christie's. Magnificent Jewels, 26 April 2017, New York, Rockefeller Center