Necklaces › 18ct White Gold Aquamarine & Diamond Necklace Image 1 of 3 Image 2 of 3 Image 3 of 3 18ct White Gold Aquamarine & Diamond Necklace £2,950.00 A stunning Aquamarine 2.25crt and Diamond Necklace in 18ct White Gold. Adjustable chain on 3 lengths, 16 inch to 20 inch. Quantity: Add To Cart Added! A stunning Aquamarine 2.25crt and Diamond Necklace in 18ct White Gold. Adjustable chain on 3 lengths, 16 inch to 20 inch.