Mens Onyx & Diamond Ring. 14K Yellow Gold Men's Rectangle Black Onyx & Diamond Ring. This 14k yellow gold ring makes a great addition to any jewelry collection and can be worn on many occasions. This ring is prong set with 60 round shape diamonds. The diamonds have a total carat weight of 0.54 carats. The diamonds are GHI color and SI-I1 clarity. There is 1 emerald cut shape onyx gemstone on this ring. This ring is part of our men's jewelry collection of jewelry.