A GEM-SET, DIAMOND AND ENAMEL BROOCH Designed as a dragonfly, its wings mounted en tremblant, applied with various colours of plique-à-jour enamel, brilliant-cut diamonds and triangular-cut rubies, its abdomen, tail and eyes set with cabochon, rectangular- and baguette-cut rubies, and brilliant-cut diamonds, mounted in gold possibly silver, length 5.2cm, width 8cm