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non precious stones

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macjillifer | 10:13 Sat 10th Sep 2005 | Science
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is there a way of telling a non precious stone in jewellry from the real thing
  
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There are also a range of liquids which have specific RI. Put the gem in it and if you cannot see it (given the same colour) it has the same RI. rough but a good 1st test and cheaper than a ri rig

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non precious stones

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