A diamond ring, by Graff

Lot 155. A 11.13 carats D VS1 Type IIa cushion-cut diamond ring, by Graff. Estimate $750,000 – $1,000,000. Price realised USD 1,325,000. Photo Christie's Image Ltd 2015

A diamond ring, by Graff 1

Set with a cushion-cut diamond, weighing approximately 11.13 carats, flanked on either side by a half moon-cut diamond, mounted in platinum. Signed Graff

With report 15716360 dated 30 December 2014 from the Gemological Institute of America stating that the diamond is D color, VS1 clarity; accompanied by a working diagram indicating that the clarity of the diamond may be potentially Internally Flawless 

Accompanied by 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, 14 April 2015, New York, Rockefeller Plaza