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Lot 1844, Important 22.40 carats D Colour, Internally Flawless Type IIa Diamond RingEstimate 25,500,000 — 31,500,000 HKD (2,947,907 - 3,641,532 EUR)Sold for HK$28,760,000 ($3,708,314). Photo Sotheby's.

Set with a  brilliant-cut diamond weighing 22.40 carats, mounted in 18 karat white gold, illustrated unmountedRing size: 5½

Accompanied by GIA report numbered 2175394911, dated 19 November 2015, stating the 22.40 carat diamond is D Colour, Internally Flawless, with Excellent Cut, Polish and Symmetry. Also accompanied by GIA diamond type classification reports stating that the 22.40 carat 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 & Jadeite, Hong Kong, 05 Apr 2016, 02:00 PM