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<p>[QUOTE=&quot;Bronwen, post: 8558633, member: 5833&quot;]What counts as a gemstone, anything that is quartz or harder?&nbsp; I know what these gem testers measure is not hardness, but it seems to work as a proxy for it.&nbsp; Genuine turquoise is quite soft relative to most things we consider semi-precious (&amp; way softer than ones we consider precious), so I would not expect it to give a reading comparable to, say, amethyst or cornelian.&nbsp; But glass comes pretty close.</p><p><br /></p><p>I haven&#039;t bought any good silver in a long while; most of what I have is inherited.&nbsp; Seems to me, though, that here in the US we still mark things &#039;sterling&#039; rather than 925.&nbsp; Maybe another Yank will come along &amp; correct me on that.[/QUOTE]</p><p><br /></p>

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