A "mystery-set" sapphire and  diamond  flower brooch, by Van Cleef & Arpels. Photo: Christie's Images Ltd 2012

Designed as two calibré-cut sapphire and circular-cut diamond flower blossoms, with baguette and marquise-cut diamond accents, to the baguette-cut diamond stems and marquise-cut diamond leaves, mounted in platinum and 18k gold, 1967, with French assay marks and maker's marks, in a Van Cleef & Arpels navy suede case. Signed Van Cleef & Arpels, no. 18354 - Lot 151. Estimate $80,000 - $120,000

Christie's. Magnificent Jewels 17 April 2012 New York, Rockefeller Plaza www.christies.com