Delicate plate brooch in platinum (850) with openwork design of lines of old-cut diamonds in pearl-grain setting alternating with lines of calibrated onyx baguettes in pearl-rail setting, and centered with seven larger, falling old-cut diamonds in pearl-rail setting. Pin in white gold (750). Art Deco work, circa 1925. Gross weight: 14.1 g. Length: 7.3 cm. - Width: 1.1 cm. Small chips.