A brooch element transformed into a pendant, consisting of a cut square of rock crystal and a clasp in platinum (950) and white gold (750) decorated with black enamel lines framing old-cut and eight-eighths diamonds, the central one larger. The clasp is set with enamel and small eight-eight diamonds. Circa 1930. Gross weight: 10.9 g. - Height Height : 4.5 cm. - Width: 2.5 cm. In a René Boivin case. A later ring for a brooch, most probably made of two squares of crystal. Damaged crystal and small chips, worn and missing enamel, damage to a hinge on the platinum clasp.