Platinum plate brooch (850) with openwork geometric decoration adorned with three half-cut diamonds in claw-set, in an entourage of antique cut, baguette and eight-eight diamonds in grain or closed settings. Pin in white gold (750). Approximate weight of the main diamonds: 0.85 carat, 1.65 carat and 0.90 carat. Gross weight: 18.3 g. - Size: 5.5 x 3 cm. Small scratches, missing the safety chain.