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Appearance
Silver Topaz is colorless. Colorless topaz is often irradiated and heat treated to form blue topaz. Silver Topaz is sometimes called "white topaz".
Enhancements
Silver topaz is not enhanced.
Most blue topaz is silver topaz that has been irradiated and heat treated, but some stones are blue naturally. London blue topaz is found in Brazil, U.S.A.
The quality used to describe a gem with a luster similar to metal. Hematite, Pyrite, Stibnite, Silver Topaz and Gibeon Meteorites are some gems which display a metallic luster.
Mohs Scale ...
Mines of Russia, Brazil and Sri Lanka gives brown, yellow, orange, sherry, red and pink topaz. Colourless topaz also known as silver topaz occurs in Brazil, Sri Lanka, Nigeria, and China.
 See also: Stone, Color, Silver, Gemstone, Hardness
  
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