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<p>[QUOTE=&quot;desertgem, post: 1574703, member: 15199&quot;]Not true, gold, silver and copper have a hardness of 2.5-3.5 depending on the alloy , whereas glass has a hardness of 6.5-7.5 generally, which is about 1,000X to 10,000 times harder than the coin metals. So a material might not scratch glass, but could scratch coin metal..</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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