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These 10x8mm Black onyx agate cabochons, characterised by their opaque black colour and high polish, are oval with a smooth domed top. For use in a setting, bezel or cup, we have a large range of sterling silver and high quality plated metal settings available to create a stunning piece of jewellery with these natural gemstone cabochons. Calibrated gemstone cabochons are sized just under the specified size to fit correctly in a setting of the same size. All measurements are approx. and may vary. Glue is required to set these. These are also fantastic for use by silver smiths to set in own designs. See our Gemstone Reference sheet for further information on Black Agate.
