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Natural Black Onyx Gemstone - Cabochon Oval Black Onyx Gemstone - Cabochon Oval

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Onyx is a form of chalcedony quartz. Many of these striking stones display white bands or ribbons against a black background. Some may include tan or brown stripes running along side the white detail. Our cabochons are flat on both sides and polished beautifully. Find a setting to fit yours in our settings section under tools & equipment.

For firing temperature and time on a variety of gemstones, refer to our Gemstone Firing Guide: