Tag Archives: heat treated

Colorless Barion Cushion Cut, probably heated.

Posted on October 1, 2013 by Bruce Fry

The piece of rough came via Thailand and was probably heated.  I used the colorless rough to make my first trial run with the Barion Cushion Cut Pattern.  It all came out well and the colorless tourmaline (achroite) is part … Continue reading →

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Medium Dark Gray Transparent Oval.

Posted on September 30, 2013 by Bruce Fry

This gray with a touch of brown is quite transparent for its darker tone value.  It came from Thailand and was probably heat treated.  I have enough similar material to feel that this color and saturation occurs in nature, but … Continue reading →

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Medium Gray Oval

Posted on September 30, 2013 by Bruce Fry

I obtained the rough for this medium gray oval from Thailand.  It has probably been heated and my principal interest was to see if I could tell the difference between heated and unheated tourmaline.  I could not tell there was … Continue reading →

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Possibly heat colorless oval

Posted on September 29, 2013 by Bruce Fry

This colorless oval could have possibly been heat treated since it went threw  Thailand from where ever it was mined.  The principle reason I purchased the rough was to see if heating effect it, in a way that I could … Continue reading →

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