Lot 318. A magnificent Type IIa diamond ring of 51.35 carats, D color, VVS1 clarity, potentially Internally Flawless. Estimate USD 5,000,000 - USD 7,000,000. Photo Christie's Image Ltd 2016.

Set with a rectangular-cut diamond, weighing approximately 51.35 carats, ring size 6, mounted in platinum

Accompanied by report no. 5172734522 dated 15 July 2016 from the GIA Gemological Institute of America stating that the diamond is D color, VVS1 clarity, 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

Christie's. Magnificent Jewels, 7 December 2016, New York, Rockefeller Plaza