Pendant brooch in yellow gold 750 thousandths and platinum 850 thousandths, set with a cabochon-cut opal weighing approx. 9 ct (natural surface flaws), in a setting of twenty-two old and pink brilliant-cut diamonds (one missing). Art Nouveau period. Opal size: 13.3 x 13.3 x 9.5 mm Total estimated diamond weight: 0.25 ct Height 2.2 cm - Width: 3 cm Gross weight : 7.2 g