Episode 17: Labradorite
23:07
Episode 40: Turquoise: Real, Simulated, Fakes, & Wannabes
18:03
Episode 59: Larimar
27:57
The Seventh Experiment: Lacerta Reveals the Truth of our Creation
27:57
Reconocimiento de los principales minerales en muestras de mano
10:01
Rock Cut! Wonderstones: Surreal, Banded, Woodgrain, Lahontan! Gorgeous Blue Chalcedony in Rhyolite!
19:52
Dentro del cañón V3 London
25:22
Episode 2: What does it take to be a good gemologist?
7:50