Lot 86. An important 15.36 carats Type IIa diamond, D color, VVS2 clarity pendant necklace, by Leviev. Estimate USD 1,300,000 - USD 1,500,000. Price realised USD 1,572,500. © Christie's Image Ltd  2018

The fine link chain suspending a heart-shaped diamond weighing approximately 15.36 carats, further accented by heart-shaped spacers set with circular-cut diamonds, 17 ins., mounted in 18k white gold, in a Leviev brown leather case.

Accompanied by report no. 2175228901 dated 25 April 2018 from the GIA Gemological Institute of America stating that the diamond is D color, VVS2 clarity; also accompanied by a working diagram indicating that the clarity of the diamond is potentially Internally Flawless.

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.