Art Deco brooch in white gold and platinum paved with diamonds

Art Deco brooch in 18k white gold (750/1000) and platinum (950/1000). The centerpiece features an old-cut diamond of approximately 1.49 ct, flanked by four baguette diamonds of approximately 0.05 ct each. The brooch is surrounded by 166 single-cut diamonds (12 diamonds of approximately 0.07 ct each, 38 diamonds of approximately 0.03 ct each, 106 diamonds of approximately 0.012 ct each, and 10 single-cut diamonds of approximately 0.0095 ct each). Total diamond weight: approximately 5.037 ct. Dimensions: 2.80 cm x 5.54 cm. Total weight: 14.78 g. Hallmarked with an eagle's head and a dog's head. Excellent condition.