Onyx & Diamond Ring. 14K White Gold Onyx & 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 15+ round shape diamonds. The diamonds have a total carat weight of 0.15 carats. The diamonds are GHI color and SI-I1 clarity. The onyx gemstones are bezel and channel set and have a total carat weight of carats. This ring is part of our gemstone collection of jewelry.