Introduction to colored stones grading (online webinar by Gem Color Academy experts)
1:48:20
Gem Color Academy webinar Gem Treatments and Their Affect on the Value
46:48
Three Precious Gems: Rubies, Emeralds, Sapphires
2:03:01
La Frecuencia Más Poderosa de Dios 1111Hz - Recibe ayuda inmediata de las fuerzas divinas
1:07:09
Webinar - Ultrafiltración y Osmosis Inversa: Fundamentos y Aplicaciones
27:06
All About Color Gem-stones, Types and Colors: Live Show #12
1:19:51
J.S. Bach: The Violin Concertos
27:47
Polariscope Tutorial by Nick Hodgson of Astrogems
51:31