Ivory, quartz and diamond brooch, Cartier, circa 1955. Photo courtesy Sotheby's

Designed as a rose, the petals and leaves composed of carved ivory and aventurine quartz, accented with circular- and single-cut diamonds, signed Cartier, numbered, partial French assay and maker's marks, case stamped Cartier. Estimate   10,000 — 15,000 CHF

Sotheby's. Magnificent Jewels. Genève | 13 nov. 2013 - www.sothebys.com