Descriptionc.1960's, with central black opal (5.33ct, 16.02mm x 12.56mm x 4.05mm estimated whilst set), oval cabochon cut from Lightning Ridge, flanked by eight round brilliant cut diamonds and twelve round single cut diamonds (total diamond weight 2.55ct), total brooch weight 7.17gm, with c clasp and oval link safety chain and pin, with valuation certificate