18K AMETHYST & DIAMOND RING: 18K white gold ring contains one emerald cut amethyst. Weight: 2.50 Ct. Approx. 6 round full cut diamonds. Weight: .15 Ct. Approx. Rated SI in clarity and H-I in color. The amethyst and diamonds are prong set. Weight: 4.4 grams. Size: 5.5