Pure topaz is colorless and transparent but is usually tinted by impurities; typical topaz is wine, yellow, pale gray or reddish-orange, blue brown. It can also be made white, pale green, blue, gold, pink (rare), reddish-yellow or opaque to transparent/translucent.
Orange topaz, also known as precious topaz, is the traditional November birthstone, the symbol of friendship, and the state gemstone for the US State of Utah.[5]
Imperial topaz is yellow, pink (rare, if natural) or pink-orange. Brazilian Imperial Topaz can often have a bright yellow to deep golden brown hue, sometimes even violet. Many brown or pale topazes are treated to make them bright yellow, gold, pink or violet colored. Some imperial topaz stones can fade on exposure to sunlight for an extended period of time.[6][7]Blue topaz is the Texas state gemstone.[8] Naturally occurring Blue Topaz is quite rare. Typically, colorless, gray or pale yellow and blue material is heat treated and irradiated to produce a more desired darker blue.[7]
Mystic topaz is colorless topaz which has been artificially coated giving it the desired rainbow effect.[9]
The hardness (Mohs scale : 8
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Natural blue color topaz is the rare stone, so many of the pale topaz are treated. Blue topaz names are called according to the shade of the blue colors, such as Sky blue, London blue and Swiss blue, etc. The prices are different. The people in the gemstones business normally know that most of the blue color topaz stones are treated so it is o.k. and acceptable if the sellers do not tell the buyers that they are treated as it is widely known that most of the good blue color topaz are treated stones.
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