A PAIR OF DELICATE MULTI-GEM AND COLOURED DIAMOND BROOCHES, BY WALLACE CHAN Each designed as a cicada holding a rectangular-cut grey or marquise-cut brown diamond, set with an oval-shaped fire opal or black opal with a carved amethyst surround, to the cabochon ruby eyes and brilliant-cut yellow to brown coloured diamond body, extending light green and blue crystal and mother-of-pearl wings with titanium veins, mounted in titanium, 7.5 and 8 cm long