Topaz actually has an exceptionally wide color range that, besides brown, includes various tones and saturations of blue, green, yellow, orange, red, pink, and purple. Colorless topaz is plentiful, and is often treated to give it a blue color. Topaz is also pleochroic, meaning that the gem can show different colors in different crystal directions. More information on Topaz can be found here.

FACTS
MINERAL: Topaz
CHEMISTRY: Al2(F,OH)2SiO4
COLOR: Yellow, orange, brown, pink to red to purple red, blue , light green and colorless
REFRACTIVE INDEX: 1.619 to 1.627
BIREFRINGENCE: 0.008 to 0.010
SPECIFIC GRAVITY: 3.53
MOHS HARDNESS: 8
-Source AGTA, GIA
 

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