An antique diamond brooch, the pierced lozenge shaped plaque set with old European and rose cut diamonds, in millegrain decoration, in 18ct gold and platinum, French hallmarks. Condition: the brooch presents in overall very good condition. All diamonds are secure in settings and are of a good commercial colour and clarity range. French hallmarks to side of brooch. Pin fitting secure. Dimensions 55 mm x 26.5 mm.