:: Grading System / Topaz

    Type topaz

    Chemical Composition Aluminum Silicate with fluorine and hydroxl
Al2(SiO4)(FOH)2(Ca2Al3(OH))(Si3O12)

    Color white, pale yellow, pale pink, pale dark blue

    Pleochroism blue topaz: blue and blue with grey

    R.I. 1.619-1.627

    Specific Gravity 3.53-3.56

    Hardness 8

Topaz in the past came from Tapazos in Red Sea. Most natural topaz has no color or sometimes has avery pale yellow color. Presently, people irradiate topaz which makes its color change to a variety of shades of blue depending on the treatment procedure.

Sources of topaz are Brazil, China, Sri Lanka, nigeria, India, and others.

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