Black onyx and Sardonyx are one of the various forms of quartz and can be found on the earth's crust along with many other gemstones. Black onyx is mined all over the world, so you are likely to come out with a lot of different shades of black and maybe even some tinges of purple here and there.
Black onyx is at its best when it is jet black. Some jewelers dye the gemstone to improve its color and sometimes to make it more opaque since black onyx is slightly translucent.
With a Moh scale hardness of 7, it is perfect for jewelry. Diamond, the hardest gemstone, has the hardest rating, which is 10.
This makes black onyx jewelry just the thing for day to day wear!
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