.10 Diamond & Onyx Right Hand Ring 14k Yellow Gold. 10 Diamond Onyx Right Hand Ring 14k Yellow Gold. This modern right hand ring features . 10 carat Round Brilliant cut diamond and a . 16 carat black onyx finished in polished 14 karat yellow gold. The diamond has a slightly warm hue and is prong set on the end of the C shaped band. On the other point of the open shank ring, a deep, cosmic black onyx, weighing . 16 carats, is prong set directly across the open space from the diamond. From the flat