A very rare platinum, carved emerald, emerald and sapphire brooch, Cartier, New York, circa 1920. photo Sotheby's

The large octagonal-shaped carved emerald depicting a Mughal flower motif, framed by channel-set calibré-cut sapphires, accented at four sides with clusters of cabochon sapphires outlined by calibré-cut emeralds and sapphires, signed Cartier N.Y. Lot 428 estimate 300,000-500,000 USD

NOTE: Together with a Certificate of Authenticity from Cartier.

Sotheby's. Magnificent Jewels. New York | 18 Apr 2012, 10:00 AM www.sothebys.com