• Hardness

  6.5.

• Occurrence

  Zoisite occurs in Tanzania (tanzanite) and Kenya, Norway, Austria, Western Australia, Italy, USA (North Carolina)

• Appearance

  Opaque, green with black streaks. Often found included with opaque ruby (corundum). Transparent green zoisite is heat treated to form violet/blue tanzanite.

• Enhancements

  Green zoisite is not enhanced. Purplish-blue is usually heat-treated.

  More information on gemstone enhancements.

  Violet-Blue Tanzanite is the result of heat-treatment, as the following photo illustrates:

  

• Tanzanite

• Zoisite

  • Item #ZOI136
    	15.76 ct.
    	20.0mm Cabochon, Round Cut
    	Medium Dark
    	Strong Reddish Purple
    	Opaque
    	[N] Not enhanced.
    	one of a kind
    Slightly Bluish Green on one side.
    Zoisite	$ 24.99

  • Item #ZOI132
    	64.32 ct.
    	29.2x26.4mm Cabochon, Oval Cut
    	Medium
    	Strong Slightly Bluish Green
    	Opaque
    	[N] Not enhanced.
    	one of a kind
    with areas of Reddish purple, White and Black.
    Zoisite	$ 79.99

  • Item #ZOI131
    	36.04 ct.
    	30.0x20.5mm Cabochon, Pear Cut
    	Medium
    	Strong Very Slightly Bluish Green
    	Opaque
    	[N] Not enhanced.
    	one of a kind
    with areas of Reddish and Black.
    Zoisite	$ 44.99

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Last updated December 7, 2007
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