Platinum, Ruby and diamond ring 'Pyramid' ring, Tiffany & Co. Photo Sotheby's

Centered by a cushion-cut ruby weighing 5.45 carats, accented by graduated rows of square emerald-cut diamonds weighing .60 carat, size 7½, signed Tiffany & Co. Estimate 50,000 — 70,000 USD

Accompanied by AGL report no. CS 56100 stating that the ruby is of Classic Thailand origin, with indications of heating.

Sotheby's. Important Jewels. New York | 24 Sep 2013 - http://www.sothebys.com