Round pendant necklace in white gold and diamond

18k white gold (750/1000) necklace. Circular pendant pavé-set with diamonds. Cable chain. 20 brilliant-cut diamonds. Total diamond weight: approximately 0.655 ct (1 diamond of approximately 0.065 ct, 6 diamonds of approximately 0.055 ct each, and 13 diamonds of approximately 0.26 ct each). Pendant dimensions: 1.21 cm x 1.22 cm. Length: 42.5 cm. Chain width: 0.07 cm. Total weight: 4.15 g. Owl hallmark. Excellent condition.