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<p>[QUOTE=&quot;Marie Forjan, post: 586034, member: 147&quot;]Yes, the range for glass is well below quartz:</p><p><br /></p><p>[ATTACH=full]175801[/ATTACH] </p><p><br /></p><p><br /></p><p>The thing I have serious trouble with is IDing CZs. I have known examples that test as glass and I had a high quality one (IDed by a jeweler) that tested in the topaz range. Also, these testers can not tell if a stone is man made or a natural stone altered in some way (heat treated etc.).[/QUOTE]</p><p><br /></p>

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