Lot 1826. Important 11.66 carats Type IIa, D colour, Internally Flawless clarity diamond ring. Estimate 13,500,000 — 16,000,000 HKD. Lot sold 18,580,000 HKD. Photo Sotheby's 2011

Simply set with a brilliant-cut diamond weighing 11.66 carats, mounted in 18 karat white gold. 

Ring size: 5½

Accompanied by GIA report numbered 1122820396, dated 7 January 2011, stating that the 11.66 carat diamond is D colour, Internally Flawless clarity, with Excellent Cut, Polish and Symmetry; also accompanied by diamond type classification report stating that the diamond is a Type IIa diamond. Type IIa diamonds are the most chemically pure type of diamond and often have exceptional optical transparency.

Sotheby's. Jewels and Jadeite, Hong Kong, 06 Apr 2011.