Gem Identification - Polariscope Basic Use
3:53
How to Use the Polariscope
9:47
Gem Identification - Refractometer Basic Use
11:46
How do you KNOW what a gem is? [Refractometer Tutorial]
32:54
How To Cut a Round Brilliant Gemstone Using a Faceting Diagram, For Beginners
7:09
Gem-A education: How to use the polariscope
5:17
Gem Identification Using Magnetism
6:25
Polariscope
3:40