Emerald Cut Aquamarine Ring w/ Diamonds in 18K White GoldEmerald Cut Aquamarine Ring w Diamonds in 18K White Gold. This beautiful modern cocktail ring features a 4. 63 carat emerald cut aquamarine with diamond accents set in 18 karat white gold. The aquamarine is set with interesting double prongs on the corners and has a very clear blue color. Contrasting with the diamonds and white gold this beautiful blue gemstone has a great size that isnt too large, but will certainly draw attention.