• 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 #ZOI137
    	27.67 ct.
    	24.4x17.3mm Cabochon, Oval Cut
    	Medium Dark
    	Strong Reddish Purple
    	Opaque
    	[N] Not enhanced.
    	one of a kind
    With areas of Slightly Bluish Green.
    Zoisite	$ 34.99

  • 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 May 18, 2010
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