Lot 234. A superb 40.43 carats Type IIa round brilliant-cut diamond. Estimate $7,000,000 – $10,000,000. Price realised USD 7,221,000. Photo Christie's Image Ltd 2016

The round brilliant-cut diamond weighing approximately 40.43 carats.

Accompanied by report no. 2175450662 dated 1 February 2016 from the GIA Gemological Institute of America stating that the diamond is D color, Flawless clarity, with excellent cut, 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 & THE JUBILEE RUBY, 20 April 2016, New York, Rockefeller Plaza