CHAUMET, Paris Plate brooch in platinum 850 and white gold 750 thousandths, with openwork geometric design, set with old-cut diamonds, including 2 larger ones in the center in claw setting. Unsigned, master hallmark. In case. Circa 1930. Weight of the 2 main diamonds: 1.50 and 1.50 ct approx. Weight of the surrounding diamonds: approx. 3 cts each. Gross weight: 13.10 g. Size: 4.4 x 2.2 cm.