Aquamarine Fantasy Collection Necklace for Women. Round neck in White Gold 750 and Diamonds P. Ct. 1 Col. G Purity Yes. Aquamarine Octagonal 7X5 Ct. 0.90. Spring-loaded ring closure. Central Width 5.69 mm. Central Length 9.82 mm. Central Depth 4.09 mm. Standard Chain Size 42cm.