• Hardness

  7.0.

• Occurrence

  Madagascar, North America, Brazil, Myanmar (Burma), Africa, Siberia, Australia, Sri Lanka (Ceylon). Tourmaline and opal are the birthstones of the month of October. Tourmaline is the national gemstone of the United States.

• Appearance

  Tourmaline of different colors often form within the same crystal. These are can be quite varied in appearance.

• Enhancements

  Occasionally heat treated to improve color.

  More information on gemstone enhancements.

• Bi-color Tourmaline

  • Item #TRM171
    	3.17 ct.
    	8.8x7.2mm Emerald Cut
    	Extremely Dark
    	Strong Violetish Blue
    	Moderately Included
    	[H] Heated to improve color.
    	one of a kind
    on two thirds of the gem. The other third is dark, strong purple red, moderatley included
    Red/Blue Bi-color Tourmaline	$ 64.99

  • Item #TRM537
    	8.79 ct.
    	12.0x11.6mm Emerald Cut
    	Medium
    	Strong Reddish Purple
    	Heavily Included
    	[N] Not enhanced.
    	one of a kind
    With a band of clear and bluish green
    Blue/White/Pink Bi-color Tourmaline	$ 269.99

  • Item #TRM502
    	1.53 ct.
    	10.3x4.4mm Rectangle Cut
    	Very Dark
    	Vivid Yellowish Green
    	Moderately Included
    	[A] Not normally enhanced.
    	one of a kind
    with Medium Strong Strongly Purplish Red.
    Bi-color Tourmaline	$ 44.99

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Last updated May 18, 2010
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