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A RARE DIAMOND RING
Set with a marquise-cut diamond weighing 16.72 carats, to the pavé-set diamond gallery and three quarter-hoop, mounted in platinum, ring size 5¾

Accompanied by report no. 2115985234 dated 16 September 2010 from the Gemological Institute of America stating that the 16.72 carat diamond is D colour, internally flawless clarity

Also accompanied by a supplemental letter from the Gemological Institute of America stating the 16.72 carat diamond has been determined to be a 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 530.20 carat Cullinan and the 105.60 carat Koh-i-noor, are examples of Type IIa

Report no. 1009036 dated 7 September 2010 from the Gübelin Gemmological Laboratory stating that the 16.72 carat diamond is D colour, internally flawless clarity

Also accompanied by an appendix and a note from the Gübelin Gemmological Laboratory stating that based on its infrared spectrum, this 16.72 carat diamond is classified as Type IIa, it also possesses an antique cutting style which is rarely encountered in the gem trade today. It displays a colour and degree of transparency which are particular to the unique gemstones of Type IIa. Diamonds of this type, exhibiting an antique cutting style as well as a fine quality, are very rare and will most certainly evoke references to the historic term of 'Golconda'

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Lot Essay

US$2,200,000-3,200,000

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