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<p>[QUOTE=&quot;Lucille.b, post: 28505, member: 51&quot;]Okay, I sounded the alarm on &quot;grinder&quot; echoed by many, but was having coffee with a physicist today and told him the story about the grinder and the old diamonds and thought I&#039;d share it.&nbsp; Expecting a big reaction, he barely looked up when I told him that the jeweler took a grinder to the diamonds!!! I said, but wouldn&#039;t the grinder possibly scratch the diamond ....especially if it was as old as 18th century?</p><p><br /></p><p>Physics: &quot;Nothing is harder than a diamond.&nbsp; It <i>couldn&#039;t</i> scratch it.&quot;</p><p><br /></p><p>But added, it would only be destructive if they weren&#039;t diamonds.</p><p><br /></p><p>Now guessing the jeweler had a solid feeling they were diamonds, just wanted to confirm it in a way he&#039;s been using all his life.</p><p><br /></p><p>So I said, buy why wouldn&#039;t you just use one of those super inexpensive diamond testers, and he said, &quot;If you are used to testing something a certain way, you have a level of certainty that you don&#039;t have with a different method.&quot;</p><p><br /></p><p>But then the coffee started getting my mind going, and I had what I thought was an amazing question:</p><p><br /></p><p>If diamonds are the hardest substance known on the planet, then how can you cut them?</p><p><br /></p><p><i>(With other diamonds.</i>)</p><p><br /></p><p>P.S. Probably best in any event to find someone who knows more about truly old jewelry.[/QUOTE]</p><p><br /></p>

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