How to Use the Polariscope
11:46
How do you KNOW what a gem is? [Refractometer Tutorial]
7:09
Gem-A education: How to use the polariscope
15:08
Unboxing a Gemologist's Spectroscope
8:53
How to use the DICHROSCOPE to test gemstones for pleochroism
3:45
Aprende Polariscope en solo 3:50 minutos
8:30
Gem Identification - Polariscope Basic Use
22:18
These Crystals can be Real Diamonds - See how to Identify
17:17