The Gemologist expertise in her laboratory fix the value of precious stones and pearls; using optical fibers, Hydrostatic Balance, Polariscope, Refractometer, Dichroscope.

The Gemologist expertise in her laboratory fix the value of precious stones and 
pearls; using optical fibers, Hydrostatic Balance, Polariscope, Refractometer, 
Dichroscope. - 66842305

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