How to Use the Polariscope
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Gemstones go to Disco?! [ Polariscope Tutorial ]
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Unboxing a Gemologist's Spectroscope
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How to use the DICHROSCOPE to test gemstones for pleochroism
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Gemology Tools: Pleochroism & the Dichroscope
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Polariscope Gem Check S/R , D/R , A,/D/R Gemology
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Polariscope
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Gem Identification - Polariscope Basic Use
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