An 18k white gold, opal, and sapphire brooch

An 18k white gold, opal, and sapphire brooch

Domed oval bezel cluster set with an opal plaque (ca. 26 x 19.94 x 6.14 mm, finely coloured) surrounded by 24 pear-cut sapphires (in total ca. 4.8 ct) and pear-cut and navette-cut diamonds (in total ca. 3.6 ct, I/J, vvs). Hallmarks: Fineness 750. Minor drying cracks to the opal. 4.5 x 5.5 cm. Weight 18.74 g.
Ca. 1970.