Plate brooch in 750 ‰ white gold and 850 ‰ platinum of rectangular shape with cut sides adorned with an openwork geometric design, entirely set with old-cut brilliants and rose-cut diamonds. In the center, two larger old-cut brilliants weighing +/- 0.80 carat each. French Art Deco period PB. 18.6 g - D. 7 x 2.5 cm