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Platinum, ruby and diamond '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. Estimation 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 sept. 2013 - http://www.sothebys.com