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 Post subject: Any Example of before-after heating cuprian tourmaline?
PostPosted: Thu Oct 27, 2022 7:43 am 
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Is there any examples of before-after heating cuprian tourmaline? is there any particular shade of purple that will produce greenish-blue or bluish green cuprian tourmaline? Pics will be very helpful


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 Post subject: Re: Any Example of before-after heating cuprian tourmaline?
PostPosted: Thu Oct 27, 2022 2:00 pm 
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Yes G.I.A. published an Extensive study on this subject. The pictures you requested are on page 15.

https://www.gia.edu/doc/Spring-2008-Gem ... mbique.pdf


However I would not rely just on color alone. Using a digital Spectrometer, I would first want to verify that Copper is present in amounts large enough to induce color.


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