5 CT AMETHYST & DIAMOND NECKLACE: 14K white gold necklace contains one pear mixed cut amethyst. Weight: 5.00 Ct. Approx. 19 round brilliant cut diamonds. Weight: .50 Ct. Approx. Rated SI in clarity and I-J in color. The amethyst and diamonds are prong set. 14K 18'' chain. Weight: 6.3 grams.