• Hardness

  6.5 - 7.0.

• Occurrence

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

• Appearance

  Bands of sard (brownish red) and onyx (white), occasionally with agate (translucent). Peridot and sardonyx are the birthstones of the month of August.

• Enhancements

  Sardonyx is usually dyed.

  More information on gemstone enhancements.

• Sardonyx

  • Item #SDX151
    	3.35 ct.
    	10.0mm Cabochon, Round Cut
    	Medium Dark
    	Moderately Strong Red
    	Translucent
    	[N] Not enhanced.
    	Quantity Available: 9
    with bands of white and yellow sard, and topped with clear agate.
    Sardonyx Chalcedony	$ 19.99

  • Item #SDX112
    	7.37 ct. total
    	12.0x10.0mm Cabochon, Oval Cut
    	Medium Dark
    	Moderately Strong Red
    	Translucent
    	[N] Not enhanced.
    	Quantity Available: 5 pairs
    Sard, with bands of white onyx.
    Sardonyx Chalcedony	$ 24.99/pair

  • Item #SDX113
    	10.55 ct.
    	18.0x13.0mm Cabochon, Oval Cut
    	Medium Dark
    	Moderately Strong Red
    	Translucent
    	[N] Not enhanced.
    	Quantity Available: 5
    Sard, with bands of white onyx.
    Sardonyx Chalcedony	$ 14.99

  • Item #SDX126
    	4.47 ct. total
    	10.0x8.0mm Cabochon, Oval Cut
    	Medium Dark
    	Moderately Strong Red
    	Translucent
    	[N] Not enhanced.
    	Quantity Available: 16 pairs
    Sard, with bands of white onyx.
    Sardonyx Chalcedony	$ 44.99/pair

  • Item #SDX133
    	4.74 ct.
    	14.0x10.0mm Cabochon, Oval Cut
    	Medium Dark
    	Moderately Strong Red
    	Translucent
    	[N] Not enhanced.
    	Quantity Available: 21
    Sard, with bands of white onyx.
    Sardonyx Chalcedony	$ 14.99

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Last updated February 2, 2008
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