There are multiple ways to check whether the Onyx gemstone is of good quality or not. Among the simplest method to check for genuineness and quality is to study the surface of the gemstone properly. Reflective, smooth surfaces with slight transparency are the features that set apart good-quality Onyx gemstones. Other features include a clean and smooth surface and the absence of cracks or scratches. There is a wide variety of black wedding ring metals too.