Something about varying levels of lithium and aluminum, I think. Aluminum helps it acquire and hold a strong smoky color, lithium for the yellow, both for bronze.
Thank you Barbra and Stephen i am not familiar with all the substances responsible for coloration of stones, wanna educate me?? I m aware of the Manganese and Copper in Tourmalines and what effect they can have on color etc, but the ones you mentioned, i do not know about. If i sent one to GIA would they be able to determine what is in the stones, like what u said LOL Sandi
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
The GIA would not usually list chromophores on an identification report. Sidebar: Trace amounts of Cu and Mn in tourmaline do not guarantee a vibrant, valuable stone. It depends on the other elements in the caldron. Since the adjective "Paraiba" can result in ridiculously inflated value, sellers look for labs listing Cu and Mn and throwing around "paraiba-type".
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