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Lot 442. Fine 11.55 carats Colombian emerald and diamond ring. Estimate  800,000 — 1,400,000 CHF (802,992 - 1,405,236 USD). Lot sold 692.000 CHF / 687.011 $. Courtesy Sotheby's

Set with a step-cut emerald weighing 11.55 carats, the mount accented with brilliant-cut and baguette diamonds, size 591/2, partial Italian maker's mark.

Accompanied by SSEF report no. 106297, dated 3 April 2019 and Gübelin report no. 0607045, dated 2 August 2006, each stating that the emerald is of Colombian origin, with a minor amount of oil in fissures.

Sotheby's. Magnificent Jewels and Noble Jewels, Geneva, 14 may 2019