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<p>[QUOTE=&quot;Marie Forjan, post: 2913666, member: 147&quot;]I notice in that listing they didn&#039;t say they tested it to make sure it&#039;s rock crystal. They say <i>&quot;It has the desired magnifying qualities and inverted optical illusion to the ball - only found in these rare pieces.&quot;</i> Yet glass in the same shape will have the <i>magnifying qualities and inverted optical illusion</i>, it&#039;s a function of the shape, not the material. So no, that is not an indicator of rock crystal, but testing in the quartz range on your tester is <img src="styles/default/xenforo/smilies/smile.png" class="mceSmilie" alt=":)" unselectable="on" />[/QUOTE]</p><p><br /></p>

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