Oval Cut Aquamarine Ring w/ Diamonds in 18K White GoldOval Cut Aquamarine Ring w Diamonds in 18K White Gold. This dazzling engagement ring features a 6. 35 carat oval cut aquamarine that is accented by two(2) trilliant cut diamonds and set in 18 karat white gold. Along with the gorgeous trilliant cuts are . 37 carats of smaller round brilliant cut diamonds that fill this ring with sparkle, and make up the thin halo around the center stone. The center stone is such an amazing blue color and contrasts