19TH CENTURY DIAMOND AND GEM-SET BUTTERFLY BROOCH The circular-cut sapphire and old brilliant-cut diamond abdomen accented by circular-cut ruby eyes, the openwork wings pavé-set with cushion-shaped, old brilliant and single-cut diamonds, highlighted by a band of circular-cut sapphires, the antennae with old brilliant-cut diamond tips, mounted in silver and gold, diamonds approximately 3.30 carats total, width 6.2cm