A 11.91 carats cut-cornered triangular-cut diamond chandelier ring

Set with a cut-cornered triangular-cut diamond, weighing approximately 11.91 carats, suspending an articulated fringe of tapered baguette-cut diamonds, to the platinum hoop. Est. $500,000 - $700,000 - Sold $674,500

With report 17492429 dated 18 November 2008 from the Gemological Institute of America stating that the diamond is D color, internally flawless clarity, with excellent polish and excellent symmetry

Accompanied by a supplemental letter 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 diamond, the 530.20 carat Cullinan and the 105.60 carat Koh-i-noor, are examples of Type IIa

Christie's. Jewels: The New York Sale. 22 April 2009. New York, Rockefeller Plaza www.christies.com Photo: Christie's Images Ltd 2009