Very fine platinum, emerald and diamond ring. Photo Sotheby's.

Set with an emerald-cut emerald weighing approximately 12.00 carats, the mounting accented by single-cut diamonds weighing approximately .60 carat,size 6¼, one diamond missing; circa 1930. Estimation 500,000 — 700,000 USD

Accompanied by AGL report no. CS 56437 stating that the emerald is of Classic Colombian origin, clarity enhancement: insignificant, type: traditional.