Antique round openwork rosette brooch, centred on an old-cut diamond of approx. 0.15 ct in a setting of smaller ones. Slight deformations. Diameter: approx. 40 mm. There is a pin slot on the back of the jewel, which was originally intended for transformation. The later pin bears a goldsmith's hallmark: horizontal rhombus "B.G"? Horse head" hallmarks. Late 19th century. Gross weight: 12.8 g. CM