31.80 carats diamond ring, Binder. Estimate 390,000 — 490,000 CHF (367,925 - 462,265 EUR). 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