Elegant Classic Halo-Style Aquamarine & Diamond Engagement Ring in 14K The Round Aqua weighs 1ct. , and is 6.5 mm. Diamonds have a total carat weight of approx. 0.50cts. Diamonds are F Colour, VS Clarity. Stones could be set on the shank, if needed. The halo-style setting is cast in 14k White Gold.