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<p>[QUOTE=&quot;Bronwen, post: 586065, member: 5833&quot;]Thanks.&nbsp; I often see eBay listings in which seller proudly claims a stone &#039;tested as thus &amp; so on my Presidium gem tester&#039;, as though that were the final word in the matter.</p><p><br /></p><p>Because the minerals that are grouped together seemed odd to me (why are aquamarine &amp; emerald separated when they are both beryl?), I was curious about what exactly it is the Presidium tests for.&nbsp; This is far from an unbiased site, but does say the machine can be good for determining glass/quartz:</p><p><br /></p><p><a href="https://www.ajsgem.com/articles/do-electronic-gem-testers-work.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.ajsgem.com/articles/do-electronic-gem-testers-work.html" rel="nofollow">https://www.ajsgem.com/articles/do-electronic-gem-testers-work.html</a></p><p><br /></p><p>I have less need for telling apart natural/lab grown, treated/not.&nbsp; Will have to consider.&nbsp; Thanks again.&nbsp; <img src="styles/default/xenforo/smilies/smile.png" class="mceSmilie" alt=":)" unselectable="on" />[/QUOTE]</p><p><br /></p>

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