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<p>[QUOTE=&quot;ToughCOINS, post: 1878624, member: 20480&quot;]That&#039;s exactly what we have to do with classic American gold to be sure it&#039;s authentic.&nbsp; Too many buyers of collectible gold coins are getting false positives on forgeries because they are rely on weight and / or purity measurements alone.&nbsp; I can&#039;t count the number of pieces I&#039;ve bought and returned to eBay sellers who&#039;d purchased fakes, and then resold them, thinking they were real.</p><p>&nbsp;</p><p>As for the &quot;ring&quot; of the tungsten coins versus gold, the frequency emitted is in direct proportion to the specific stiffness (rato of density to modulus of elasticity) of the material.&nbsp; I haven&#039;t compared the two ratios, but tungsten is roughly twice the stiffness of steel - far more stiff than gold - and therefore should ring at a much higher pitch than gold does.</p><p>&nbsp;</p><p>&nbsp;- Mike[/QUOTE]</p><p><br /></p>

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