FACET & CAB ROUGH
STILL UNDER CONSTRUCTION!
White to Imperial Orange, Brown and Champaign: Irradiation...
Brown to Orange: Heats to pink...
it is irradiated to brown and then heated to a rich sky blue
Blue Topaz starts as an off color, usually bluish-gray to silvery-gray in color, and it is irradiated with gamma or electron Irradiation, in conjunction with heat to produce bold colors like the blue-green color "London Blue", the light blue color "Sky Blue", the medium blue color "Swiss Blue", and the more intense blue color "Maxi Blue".
White to Pink: Cobalt 60 Irradiation will generally push White and Pastel Pink Tourmaline to a range of Pinks, Reds and Brownish Reds. The actual dosage will vary by locality and type of Tourmaline; however, dosage is generally between 20-150 Megarads. Heating Reds & Pinks will cause the opposite effect and have them go White. Carefully calibrated heating can help remove the Brown overtones in Red and Pink Tourmaline; however, a miscalculation will have you end up with Achroite. You can always hit the Tourmaline with Cobalt 60 but that gets costly.
Lighten Dark Stones: Tourmaline generally lightens up with heat treatment. Dosages vary by locality with certain localities producing Tourmaline unresponsive to heat treatment. Dosages vary by locality as well as results; however, Darker blues will generally get lighter and Reds & Pinks will lighten or go to White. Grays and Steel colored stones will generally go to a Minty Greens or Neon Blues.
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Last Updated: 01/05/2009 05:59:32 AM