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Gemstone: Black Onyx Size: 8x5mm Origin: China Description: Natural Black Onyx gemstone hexagon shaped tubes; approximately 46 to 50 beads on each strand; A grade Quantity: One 16 inch strand per pak. Enter quantity below. - Onyx is a semiprecious variety of chalcedony. When chalcedony is variegated with spots or patterns, or arranged in different colored layers, it is called agate. Black onyx can appear opaque or translucent. It naturally occurs black but is frequently dyed or enhanced to improve its color.
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