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<p>[QUOTE=&quot;desertgem, post: 685522, member: 15199&quot;]Yes, I know what you meant, but I feel that there are reasons, we just haven&#039;t the tools yet to discover them. But I blame that on my training, and I have learned not to discount the unexplainable. When I started exploring the coloration of gemstones, I found it far from simple. For instance since the color of a Ruby or Sapphire depend on energy level exchanges in the quantum range, a Ruby has no color in complete darkness ( lack of photons), but how could one tell as without light (photons), you can&#039;t see color ? Lots of these problems exist in science. Before quantum explanation of color, many disbelieved the theory of certain color changing gems such as&nbsp; Alexandrite and Diaspore ( now hyped as Zultanite), thinking it was just reflections of fluorescent vs incandescent light ( red-green) , but now it is known to be related to the energy levels of chemical compounds in the gems under the different light. It is now easy to find &quot;Lab grown Alexandrite&quot; which can change color better than the natural.</p><p><br /></p><p>So do toned coins maintain their color in the dark?&nbsp; <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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