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Gemstones, Minerals & Fossils
Lapidary
Checking My Stones
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<blockquote data-quote="Mr Magoo" data-source="post: 438030" data-attributes="member: 3008"><p>If it's the surface of the stone try putting oil on it. You can buy liquids that are close to the refractive index (RI) of the stone being tested where you submerge the stone in an immersion cell (small jar) and the stone becomes invisible but the flaws stand out. This is because of the difference of RI in the flaws and the stone.</p></blockquote><p></p>
[QUOTE="Mr Magoo, post: 438030, member: 3008"] If it's the surface of the stone try putting oil on it. You can buy liquids that are close to the refractive index (RI) of the stone being tested where you submerge the stone in an immersion cell (small jar) and the stone becomes invisible but the flaws stand out. This is because of the difference of RI in the flaws and the stone. [/QUOTE]
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Gemstones, Minerals & Fossils
Lapidary
Checking My Stones
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