Lot 360. Important 15.04 carats, D Colour, VVS1 Clarity diamond ring, Cusi. Estimate 1,000,000 — 1,500,000 CHF. Courtesy Sotheby's 2018. 

Set with a marquise-shaped diamond weighing 15.04 carats, between tapered baguette diamond shoulders, size 55, signed Cusi, Italian assay mark for platinum and maker's mark.

Accompanied by GIA report no. 8511087, stating that diamond is D Colour, VVS1 Clarity, together with a type IIa classification letter.

Sotheby's. Magnificent Jewels and Noble Jewels, Genève, 15 mai 2018, 10:30 AM