Impressive 31.93 carats Type IIa pear-shaped diamond ring. Estimate 3,400,000 — 3,800,000 CHF (3,207,552 - 3,584,911 EUR). Photo Sotheby's

Claw-set with a pear-shaped diamond weighing 31.93 carats, size 52.

Accompanied by GIA report no. 2165810600, stating that the diamond is D Colour, VS1 Clarity, Excellent Polish and Symmetry; together with a Type IIa classification letter.  

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