Pendant necklace in 2 golds and diamond

18k yellow gold (750/1000) necklace set with a diamond in white gold. English link chain. One brilliant-cut diamond, total weight approximately 0.45 ct. Motif dimensions: 1.53 cm x 1.04 cm. Chain length: 45 cm. Chain width: 0.27 cm. Total weight: 14.97 g. Eagle's head hallmark. Excellent condition.