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<p>[QUOTE=&quot;Figtree3, post: 140545, member: 33&quot;]Some time ago Calico recommended a Presidium gem tester. I got one and love it! Although recently realized that I didn&#039;t learn how to use it to its full capability. <img src="styles/default/xenforo/smilies/smile.png" class="mceSmilie" alt=":)" unselectable="on" /></p><p><br /></p><p>The one she recommended, and that I got, is the Presidium Duo Tester. I got the PDT-S7. It does not differentiate between natural and synthetic colored gemstones, but is good enough for my purposes.</p><p><br /></p><p>These are a bit expensive, but it turned out that I could use &quot;points&quot; from my credit card through Amazon to bring the price down by half.[/QUOTE]</p><p><br /></p>

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