Gem Tools: Refractometer
18:09
Easy Gem Tests Gemologists Actually Use
17:44
How To ID Gemstones | Specific Gravity, Density & More!
10:15
Refractometers, How Do They Work? (And Should You Buy One?)
11:46
How do you KNOW what a gem is? [Refractometer Tutorial]
15:59
Identifying NATURAL vs LAB Created Stones
15:08
Unboxing a Gemologist's Spectroscope
8:30
Gem Identification - Polariscope Basic Use
17:17