White gold (750) and platinum (850) brooch, rectangular shape with crenellated edges and openwork geometrical motifs, entirely set with baguette, eight-eight and old-cut diamonds in beaded or closed settings, and centered with a larger half-cut diamond on a hexagonal bezel. Platinum pin (850). Circa 1925-30. Approximate weight of the main diamond: 0.65 carat. Gross weight : 18,7 g - Dim. 6,2 x 3,2 cm. Scratches and scuffs.