The Light of Golgonda. An exceptionally rare diamond ring. Photo Sotheby's

The old mine cushion-shaped diamond weighing 33.03 carats, mounted in platinum, size 6.

Accompanied by a GIA report no. 1132099959 stating that the diamond is D color, Internally Flawless. Together with a letter from the GIA stating that the diamond has been determined to be type IIa.

Accompanied by Gübelin report no. 11070062 stating that the diamond is D color, Internally Flawless. Together with a note stating that the diamond is classified as type IIa, and an appendix stating "the diamond of 33.03 carats possesses an antique cutting style which is rarely encountered in the gem trade today. In addition, this diamond is classified as type IIa (a chemically very pure type of natural diamond). It displays a colour and degree of transparency which are particular to the finest of these unique gemstones. Diamonds of this type, exhibiting an antique cutting style as well as a superior quality, are very rare and will most certainly evoke references to the historic term of 'Golconda'.

Sotheby's. Magnificent Jewels. New York | 07 Dec 2011 www.sothebys.com