Lot 446. Very fine 17.39 carats Type IIa diamond ring. Estimation 2,400,000 — 2,800,000 CHF. Lot sold 2,710,000 CHF. Photo Sotheby's. 

Set with a brilliant-cut diamond weighing 17.39 carats, size 52. 

Accompanied by GIA report no. 2165988391, stating that the diamond is D Colour, Internally Flawless, Excellent Cut, Polish and Symmetry, together with a Type IIa classification letter.