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$4.65 USDSize Guide
Onyx primarily refers to the parallel banded variety of the silicate mineral chalcedony. Agate and onyx are both varieties of layered chalcedony that differ only in the form of the bands: agate has curved bands and onyx has parallel bands.
Cabochon: Black Onyx
Size: 30x40mm (3-4mm Thick)
All Sizes Approximate