an_unusual_coloured_diamond_ring_d5631181h

An Unusual Coloured Diamond Ring. Photo Christie's Image Ltd 2012

Set with a cushion-shaped fancy brown-yellow diamond weighing 36.58 carats, mounted in 18k rose gold, ring size 5¾

Accompanied by report no. 1142714933 dated 23 may 2012 from the Gemological Institute Of America stating that the 36.58 carat diamond is fancy brown-yellow, natural colour, VS1 clarity; also accompanied by a supplemental letter from the Gemological Institute Of America stating the 36.58 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 530.20 carat Cullinan and the 105.60 carat Koh-I-Noor, are examples of type IIA

Also accompanied by report no. 12050057 dated 16 may 2012 from the Gübelin Gemmological Laboratory stating that the 36.58 carat diamond is fancy brown, natural colour, VS1 clarity; also accompanied by an appendix and note stating that the 36.58 carat diamond displays an antique shape and cutting style which were often encountered in older cuts. minor irregularities in both size and shape of the different facets, resulting in some leakage of light, are therefore rather expected characteristics of these old cuts. diamonds such as this are endowed with distinct personality and charm which are not found in the more modern brilliant cutting styles. in addition, based on its infrared spectrum, the 36.58 carat diamond is classified as a type IIA

Christie's. Hong Kong Magnificent Jewels. 27 November 2012. Hong Kong