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Black Onyx is the solid black form of onyx, a chalcedony in the quartz family, and the one most people picture when they hear the name. It has been worn for centuries as a stone of strength, self-mastery and composure. Nearly all of it is chalcedony treated to a deep, even black, a long-accepted practice that we state plainly rather than hide.
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Meaning, properties, history and care, in full. Updated October 12, 2026