• Hardness

  6.5 - 7.0.

• Occurrence

  Worldwide. A member of the chalcedony family (micro-crystalline quartz).

• Appearance

  Onyx is the name given to chalcedony which is uniform in color, generally black or white. Onyx should not be confused with onyx marble, a banded stone which is a form of limestone (calcite or aragonite).

• Enhancements

  Black and colored onyx is always dyed.

  More information on gemstone enhancements.

• Black Onyx

• Onyx

  • Item #ONX134
    	4.39 ct. total
    	10.0x8.0mm Cabochon, Oval Cut
    	Black
    	Opaque
    	[N] Not enhanced.
    	Quantity Available: 7 pairs
    with bands of white sard.
    Onyx Chalcedony	$ 24.99/pair

  • Item #ONX103
    	9.98 ct. total
    	16.0x12.0mm Cabochon, Facetted Cut
    	Black
    	Opaque
    	[D] Dyed.
    	Quantity Available: 3 pairs
    Faceted
    Onyx	$ 9.99/pair

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Last updated May 18, 2010
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