细节
A RARE DIAMOND RING
Set with a cushion-shaped diamond weighing 13.15 carats, to the brilliant-cut diamond half-hoop, mounted in 18k white gold, ring size 5½
Accompanied by report no. 2125960462 dated 28 January 2011 from the Gemological Institute of America stating that the 13.15 carat diamond is D colour, flawless clarity, with excellent polish and symmetry
Also accompanied by a supplemental letter from the Gemological Institute of America stating the 13.15 carat diamond has been determined to be type IIa. 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 530.30 carat Cullinan and the 105.60 carat Koh-i-noor, are examples of Type IIa