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<p>[QUOTE=&quot;-jeffB, post: 5252228, member: 27832&quot;]Tungsten isn&#039;t <i>ferro</i>magnetic, it&#039;s <i>para</i>magnetic. I don&#039;t have direct experience, but as I understand it, the effect is way too weak to detect with an ordinary bullion-checking magnet. Have you actually been able to lift tungsten with a magnet? I know there&#039;s tungsten jewelry, and if you come across any, it would be worth trying.</p><p><br /></p><p>The tungsten-filled fake gold I&#039;ve seen (pictures, not in person) has a <i>thick</i> outer layer of gold around a tungsten core. You can strike up a coin from one of those blanks, but tungsten itself is too hard to strike -- that&#039;s why it would be hard to make a tungsten coin and then gold-plate it.</p><p><br /></p><p>This technique is bad news for XRF, too, because the X-rays from the gun can&#039;t penetrate the gold deeply enough to reach the tungsten and produce a signal. As far as I know, the best ways to check for tungsten-filled gold (especially bars) are electrical or acoustic (ultrasound). I&#039;m guessing that one of those Sigma machines <i>might</i> reject a gold coin with a tungsten core, but again, no direct experience.[/QUOTE]</p><p><br /></p>

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