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To determine if a stone is black onyx, first examine its translucence; genuine onyx will often have a slight translucency, while many black stones may appear completely opaque. You can also check for banding; onyx typically features distinct layers or bands, even in black varieties. Lastly, you can perform a scratch test or consult a gemologist, as onyx has a specific hardness on the Mohs scale (around 7).

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2mo ago

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