Lot 352. Fine 13.70 carats Colombian  emerald and diamond ring. Estimate 400,000 — 600,000 CHF. © Sotheby's 2018.

Claw-set with a step-cut emerald weighing 13.70 carats, between shoulders set with shield-shaped diamonds, size 49, numbered, maker's mark, illustrated unmounted.

Accompanied by SSEF report no. 98160, and Gübelin report no. 18030164, both stating that the emerald is of Colombian origin, with a minor amount of oil in fissures.

Sotheby's. Magnificent Jewels and Noble Jewels, Geneva, 15 May 2018, 10:30 AM