How do you KNOW what a gem is? [Refractometer Tutorial]
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Gem Identification - Refractometer Basic Use
17:17
Gemology Tools: What Do I Buy, When?
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Easy Gem Tests Gemologists Actually Use
13:10
How to Check Blue Sapphire Beryllium Diffusion Treatment using Water Immersion Technique
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Gem-A Education: How to use the refractometer
12:46
💎 How To Tell A Fake Or Real Diamond! I Spot A Cubic Zirconia, Moissanite, Lab & Earth Diamond
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Presidium Gem Tester II (PGT II) - Testing Emerald, Diamond, Sapphire, Ruby, Nephrite
11:07