Art Deco Platinum Diamonds Emerald Cut 1.25 Carat Aquamarine Ring. The aquamarine is a beautiful color the best we have seen and it has a diamonds border. There are 26 diamonds I color VS2 clarity platinum set around the ring. The combined diamonds weight is .78 carat. The ring size is 7-1/2. It weighs 3.7 grams. The inside of the ring shank is engraved with the Aquamarine weight of 1.25 carat and the platinum purity of 950.