Amethyst & Diamond Ring. 14K White Gold Amethyst & Diamond Ring. This 14k white gold ring makes a great addition to any jewelry collection and can be worn on many occasions. This ring is prong set with 30+ round shape diamonds. The diamonds have a total carat weight of 0.18 carats. The diamonds are GHI color and SI-I1 clarity. There is 1 oval shape amethyst gemstone on this ring. The gemstone is prong set and has a total carat weight of 2.44 carats. The gemstones measure 8 x 10 mm. This ring is part of our gemstone collection of jewelry.