Very fine 17.39 carats Type IIa brilliant-cut diamond ring. Estimate 2,400,000 — 2,800,000 CHF (2,264,154 - 2,641,513 EUR). 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.

Sotheby's. Magnificent Jewels and Noble Jewels, Geneva, 12 May 2015, 10:30 AM