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Platinum, ruby and diamond ring, Aletto Brothers. Photo: Sotheby's.

The navette-shaped dome invisibly-set with calibré-cut rubies, flanked by two butterflies set with round, baguette, pear and marquise-shaped diamonds weighing approximately 1.95 carats, size 6¼, signed Aletto Bros. Estimation 18,000 — 22,000 USD

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