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<p>[QUOTE=&quot;Vess1, post: 625422, member: 13650&quot;]I wouldn&#039;t try it with a proof commemorative or a really high dollar BU coin unless as a last resort, and only if the authenticity was in question.&nbsp; &nbsp; It would be a judgement call based on the coin.&nbsp;&nbsp; I personally would risk the small amount of damage on a coin in question to verify it if I really wanted to know.&nbsp; Even if it did leave a small scuff.</p><p><br /></p><p>&nbsp; The stone is very very fine grit.&nbsp; Most things you could probably get enough gold off of for the test with one light swipe.&nbsp; It does very little damage.&nbsp; It only takes a very minute amount.&nbsp; For a more accurate test though, you&#039;d probably want to make sure you at least got through a possible plated layer.</p><p><br /></p><p>&nbsp;The coins in this thread appear to be good candidates.&nbsp; They may be real gold.&nbsp; At least he could find that out.&nbsp;&nbsp; Although it still would not authenticate them as being genuine of course.[/QUOTE]</p><p><br /></p>

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