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Rough: Black chalcedony, onyx
$5.00

Black chalcedony onyx in the rough is from Africa. Stock #403.  Large rough will weigh from 10-20 pounds each, and smaller rough may be saw blocked from 2 pounds and up. This popular semi-precious gemstone is great for classic color jewelry, as a base for items of interest for display, and or used as a base for opal cabochons, which will brighten the colors of the opal. The image shows a black chalcedony onyx slab. 


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