What is this Mystery Stone?
6:20
Sapphire's Evil Twin [In the Loupe]
3:53
How to Use the Polariscope
18:09
Easy Gem Tests Gemologists Actually Use
9:51
The Truth Behind Bling
11:29
How This 8,000-Pound Crystal Went From Mine To Smithsonian | Big Business | Business Insider
6:35
A Sapphire's Secrets [In the Loupe]
15:08
Unboxing a Gemologist's Spectroscope
5:11