18K (750‰) white gold and platinum (850°/°°) plate brooch of rectangular shape with openwork decoration centred on an old-cut cushion diamond weighing approximately 0.60 ct (pitted stone) in a setting entirely set with old-cut diamonds (one missing, slight chips) and rose-cut diamonds. French work Dimensions: approx. 54 x 20 mm - Gross weight: 10.8 g.