Lot 441. 31.80 carats of yellow tint diamond ring, Binder. Estimate 390,000 — 490,000 CHF (367,925 - 462,265 EUR). Lot sold 730,000 CHF. Photo: Sotheby's.

Set with a cushion-shaped diamond weighing 31.80 carats of yellow tint, size 53, sizing band, signed Binder, maker's mark, case stamped Binder. 

Sotheby's. Magnificent Jewels and Noble Jewels, Genève, 12 mai 2015, 10:30 AM