Lot 195. 21.35 carats, I colour, VVS1 clarity Type IIa Emerald-cut Diamond Ring. Estimate: HK$8,800,000 - 9,800,000 (US$ 1,130,000 - 1,260,000). Courtesy Tiancheng International.

Centring on an emerald-cut diamond weighing 21.35 carats, flanked by shield-shaped diamonds together weighing approximately 1.85 carats, mounted in 18 karat white gold. Ring size: 6¼

Accompanied by GIA report numbered 5206600705, dated 18 August 2015, stating that the 21.35 carat diamond is I colour, VVS1 clarity; along with a diamond type classification stating that the 21.35 carat emerald cut 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 diamonds, the 530.20 carat Cullinan I and the 105.60 carat Koh-i-noor are examples of type IIa';

HRD report numbered 11013186001, dated 3 May 2011, stating that the 21.35 carat diamond is H colour, VVS1 clarity. 

Tiancheng International. HONG KONG SPRING AUCTION, Jewellery and Jadeite. 12 Jun · 1 pm