Shiny, black, and smooth, onyx is the mystical birthstone of December, and a black onyx ring or a black onyx pendant makes a perfect birthday gift. Durable and easy to care for, onyx has a hardness of 7. For safe cleaning, use a solution of warm water and mild dish soap, scrubbing with a soft brush to remove dirt and dust. As with all fine jewelry, onyx should be removed before sleeping.
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