Aquamarine Fantasy Collection Necklace for Women. Round neck in White Gold 750 and Diamonds P. Ct. 1 Col. G Purity Yes. Aquamarine Drop 7X5 Ct. 0.65. Spring-loaded ring closure. Central Width 5.30 mm. Central Length 9.71 mm. Central Depth 3.81 mm. Standard Chain Measurement 42 cm.