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<p>[QUOTE=&quot;wenna, post: 379555, member: 541&quot;]OK, I broke out my (admittedly inexpensive) diamond tester and read the instructions for the second time; I think I got it in an amateur kind of way.&nbsp; All the stones except for the possibly coral one tested much harder than compared to glass.&nbsp; The blue ones tested as hardest.&nbsp; One of them even kept going into &#039;diamond&#039; territory.&nbsp; I am using a Diamond Tester II.&nbsp; So, I think I can say they are not glass anyway.&nbsp; I also did the vinegar test on the coral stone (hope I don&#039;t get in trouble for that).&nbsp; It took a few seconds but it did develop bubbles all over the surface.&nbsp; I rinsed it really well after.[/QUOTE]</p><p><br /></p>

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