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<p>[QUOTE=&quot;desertgem, post: 905927, member: 15199&quot;]And I apologize for not noticing that you are new, and Welcoming you to the forum! </p><p>The spectroscopic analysis that these 2&nbsp; ( PCGS and NGC) companies utilize are non destructive and highly accurate. About the only physical way commonly available is to scratch through the surface to see if it is a coating or chemical reaction, and this is to be avoided until you have further information.[/QUOTE]</p><p><br /></p>

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