Gemology Tools: What Do I Buy, When?
12:22
What is this Mystery Stone?
11:46
How do you KNOW what a gem is? [Refractometer Tutorial]
1:11:32
Gem-A Live: Understanding Gemstone Species and Varieties
6:24
Identifying Faceted Gemstones with Pro Gemology Tools!
29:50
Buying sapphire gemstones in thailand bangkok
18:09
Easy Gem Tests Gemologists Actually Use
18:24
Presidium Gem Tester II (PGT II) - Testing Emerald, Diamond, Sapphire, Ruby, Nephrite
8:30