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<p>[QUOTE=&quot;Bronwen, post: 430099, member: 5833&quot;]Not sure if it answers or raises more.&nbsp; It does raise the possibility that the stone is in fact stone and not glass after all.&nbsp; And the happier possibility that I didn&#039;t overpay for it after all.&nbsp; Right now my head is reeling from reading there, consulting another mineralogical reference and pulling out other stones to see how they react under the light.</p><p><br /></p><p>The one really grass green tourmaline I have does not turn red.&nbsp; As the article explains, the same color to the eye does not mean they are the same at the molecular level.&nbsp; The chrome diopside earrings I have turn a very dark reddish brown.</p><p><br /></p><p>I had already found that color change sapphires make a very dramatic shift.&nbsp; Under ordinary mixed lighting conditions they&#039;re a vivid purple with glints of peacock blue.&nbsp; Incandescent light shifts them toward hot pink.&nbsp; Some wavelengths of fluorescent make them look predominantly the peacock blue.&nbsp; The UV surprise is that when the light is shined at a stone straight on, so that it passes through and bounces back out off the back facets, the stone looks this same deep, slightly blue red as the stone under discussion, with bright green glints.&nbsp; If the light is held a bit to the side, so it hits the stone obliquely, it&#039;s all bright green.&nbsp; Tourmalines that are green due to vanadium may not fluoresce red, but sapphires colored with this metal sure as heck do.[/QUOTE]</p><p><br /></p>

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