A striking opal, onyx and diamond bracelet, 9ct rose and white gold, designed as an Art Deco inspired plaque brooch, set with large rectangular onyx panel, claw set centrally with an oval cabochon solid crystal opal, measuring 15 x 11.2 x 8 mm, strong colours throughout, claw set in an open backed mount, edged in a geometric arrangement of grain and bezel set brilliant cut diamonds, connecting to black onyx links and further diamond work, completed with a double black cord strap with diamond set clasp detail, length 18.5 cm