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<p>[QUOTE=&quot;Bronwen, post: 4506839, member: 5833&quot;]Diamond is the hardest substance produced naturally on earth &amp;, on the Mohs hardness scale, corundum (sapphire &amp; ruby) is second hardest, so vinegar is not going to touch them.&nbsp; Mind, &#039;hardness&#039; is ranked by what can scratch what, not by ability to endure blows.&nbsp; Don&#039;t try hitting an unknown stone with a hammer to see if it is hard enough to be diamond.</p><p><br /></p><p>The effect of solvents on the mount &amp; its ability to hold the stones is another matter.[/QUOTE]</p><p><br /></p>

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