Lot 299. Important 15.15 carats, D Colour, Internally Flawless Type IIa step-cut diamond ring, Graff. Estimate 1,380,000 — 1,770,000 CHF. Photo: Sotheby's.

Set with a step-cut diamond weighing 15.15 carats, between tapered baguette diamonds, size 49, signed Graff.

Accompanied by GIA report no. 10312408, dated 31 March 2014, stating that the diamond is D Colour, Internally Flawless, together with a Type IIa classification letter.

Sotheby's. Magnificent Jewels and Noble Jewels, Geneva, 16 Nov 2016, 10:30 AM