|Dimensions||8 × 0.314961 mm|
|Stone Country of Origin||
Black Onyx perhaps the most famous variety, but is not as common as onyx with colored bands. Artificial treatments have been used since ancient times to produce both the black color in “black onyx” and the reds and yellows in sardonyx. Most “black onyx” on the market is artificially colored. Mohs hardness 6 – 7.
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