A solid white opal and diamond set brooch, 18ct yellow gold and platinum, retailed through Catanachs, presented as a solid cabochon white opal of strong blocked spectral colours, lime, red, blue and violet throughout, weighing approximately 1`6.80ct, bezel set in an open backed mount, framed by forty old cut diamonds totalling approximately 1.20ct, scalloped to frame, fitted with pin to reverse. Length 3.5 cm