.84 Oval Cut Aquamarine Ring w/ Diamonds in Platinum. 84 Oval Cut Aquamarine Ring w Diamonds in Platinum. This beautiful modern cocktail ring features a 2. 26 carat oval cut aquamarine with two(2) trilliant cut diamonds set in platinum. The center stone is a lovely light blue, and combined with the white diamonds it invokes the sky with soft clouds on a summer day. The trilliant cut diamonds allow the outer border to continue and flow down into the shank for a clean and elegant look.