Brooch in pink gold 750 thousandths, set with a cabochon-cut opal, approx. 0.70 ct, in a surround of twenty-six small rose-cut diamonds. Late 19th century. Opal size: 9.7 x 4.4 x 3.2 mm Total estimated diamond weight: 0.05 ct Height 1 cm - Width : 5 cm Gross weight: 3.3 g