Highly important unmounted 30.57 carats Type IIa diamond. Estimate 46,000,000 — 53,000,000 HKD. Lot Sold. 51,080,000 HKD. Photo Sotheby's

An unmounted brilliant-cut diamond weighing . 

Accompanied by GIA report numbered 2155730667, dated 31 October 2013, stating that the diamond is D colour, Flawless clarity, with Excellent Cut, Polish and Symmetry; further accompanied by diamond type classification report stating that the diamond is determined to be a Type IIa diamond. Type IIa diamonds are the most chemically pure type of diamond and often have exceptional optical transparency.

Sotheby's. Magnificent Jewels and Jadeite, Hong Kong | 07 Apr 2014