An important 8.05 carats marquise brilliant-cut Type IIa diamond ring. Estimate $600,000 – $800,000. Photo Christie's Image Ltd 2015

Set with a marquise brilliant-cut diamond, weighing approximately 8.05 carats, ring size 6 3/4, mounted in platinum

Accompanied by report no. 6177085644 dated 17 June 2015 from the GIA Gemological Institute of America stating that the diamond is D color, Internally Flawless clarity

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. IMPORTANT JEWELS, 20 October 2015, New York, Rockefeller Plaza