Platinum, Colombian Emerald and Diamond Ring, circa 1925, Tiffany & Co. Estimate 150,000 — 250,000 USD. Photo: Sotheby's

Centering an oval-shaped cabochon emerald measuring approximately 19.2 by 12.6 by 7.7 mm, flanked by trapeze-cut diamonds weighing approximately 1.60 carats, further set with square-cut diamonds weighing approximately .25 carat, size 6½, signed Tiffany & Co.; circa 1925. With signed box.

Accompanied by AGL report no. CS 60816 stating that the emerald is of Colombian origin, clarity enhancement: minor, type: traditional.

Sotheby's. Important Jewels, New York, 24 Sep 2015