• Hardness

  7.0.

• Occurrence

  Found worldwide.

• Appearance

  Brownish-black to black and opaque. Much black onyx is the brownish variety that has been dyed black. Can be confused with black spinel.

• Enhancements

  Black onyx is always dyed.

  More information on gemstone enhancements.

• Black Onyx

  • Item #ONX118
    	45.49 ct. total
    	20.0mm Cabochon, Round Cut
    	Black
    	Opaque
    	[D] Dyed.
    	Quantity Available: 4 pairs
    Black Onyx	$ 39.99/pair

  • Item #ONX119
    	0.16 ct. total
    	3.0mm Cabochon, Round Cut
    	Black
    	Opaque
    	[D] Dyed.
    	only one pair available
    Onyx Chalcedony	$ 2.99/pair

  • Item #ONX101
    	11.60 ct. total
    	16.0x12.0mm Cabochon, Oval Cut
    	Black
    	Opaque
    	[E] Routinely enhanced.
    	Quantity Available: 2 pairs
    Black Onyx	$ 4.99/pair

  • Item #ONX166
    	21.02 ct.
    	25.0x18.0mm Cabochon, Oval Cut
    	Black
    	Opaque
    	[N] Not enhanced.
    	Quantity Available: 4
    Faceted
    Black Onyx	$ 8.99

  • Item #ONX167
    	20.94 ct.
    	25.0x18.0mm Cabochon, Oval Cut
    	Black
    	Opaque
    	[N] Not enhanced.
    	~
    with white band of onyx.
    Black Onyx	SOLD

  • Item #ONX169
    	21.02 ct.
    	25.0x18.0mm Cabochon, Oval Cut
    	Black
    	Opaque
    	[N] Not enhanced.
    	~
    with white band of onyx.
    Black Onyx	SOLD

  • Item #ONX141
    	0.24 ct. total
    	3.0x5.0mm Cabochon, Pear Cut
    	Black
    	Opaque
    	[D] Dyed.
    	only one pair available
    Black Onyx	$ 3.49/pair

  • Item #ONX142
    	0.40 ct.
    	4.0x6.0mm Cabochon, Pear Cut
    	Black
    	Opaque
    	[D] Dyed.
    	one of a kind
    Black Onyx	$ 2.99

  • Item #ONX132
    	7.37 ct. total
    	10.0mm Cabochon, Square Cut
    	Black
    	Opaque
    	[N] Not enhanced.
    	Quantity Available: 10 pairs
    Black Onyx	$ 24.99/pair

  • Item #ONX145
    	6.88 ct.
    	12.0mm Cabochon, Square Cut
    	Black
    	Opaque
    	[E] Routinely enhanced.
    	Quantity Available: 17
    black Onyx	$ 19.99

  • Item #ONX162
    	8.63 ct.
    	15.0mm Cabochon, Heart Cut
    	Black
    	Opaque
    	[N] Not enhanced.
    	one of a kind
    Pendant with sterling silver chain
    Black Onyx	$ 9.99

  • Item #ONX133
    	3.22 ct. total
    	12.0mm Cabochon, Trillion Cut
    	Black
    	Opaque
    	[N] Not enhanced.
    	Quantity Available: 5 pairs
    Black Onyx	$ 24.99/pair

  • Item #ONX120
    	5.19 ct.
    	14.0x10.0mm Roll Top Cut
    	Black
    	Opaque
    	[D] Dyed.
    	one of a kind
    Black Onyx	$ 34.99

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Last updated June 10, 2010
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