Lot 1707. Very Fine 13.60 carats, D Colour, Flawless, Type IIa Diamond Ring, Cartier. Estimate 41,000,000 — 50,000,000 HKD. Photo: Sotheby's.

Set with a cut-cornered rectangular step-cut diamond weighing 13.60 carats, flanked by two baguette diamonds, mounted in platinum, signed Cartier and indistinctly numbered. Ring size: 6¼

Accompanied by GIA report numbered 1172422938, dated 17 March 2016, stating that the 13.60 carat diamond is D Colour, Flawless, with Excellent 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 & Jadeite, Hong Kong, 04 Oct 2016, 02:00 PM