Platinum, carved emerald and diamond pendant-brooch necklace. Photo courtesy Sotheby's 

Centering an emerald carved on both sides with floral motifs measuring approximately 36.6 by 27.0 by 7.3 mm, accented at the sides by old European-cut diamonds weighing approximately 1.25 carats; fitted with a detachable brooch fitting, together with a platinum openwork chain (not illustrated), length 20 inches; circa 1920. Lot. Vendu 161,000 USD

Sotheby's. Magnificent Jewels. New York | 11 Dec 2013 - www.sothebys.com