A platinum diamond and mystery-set sapphire flower pin designed as a calibre-cut sapphire flower, centering upon diamond cluster pistil, extending a baguette-cut diamond stem and marquise-cut diamond leaves, exquisitely mounted in platinum. The 'Mystery-Set' technique was invented by Van Cleef & Arpels in 1933, which is a technique used for setting gemstones in a specific way so that no prongs are visible.