Gem-A Live: Man-made Stones Explained
1:03:46
Gem-A Live: Laser Drilled Diamonds
1:11:00
Gem-A Live: Fluorescence
1:11:32
Gem-A Live: Understanding Gemstone Species and Varieties
51:31
Gem-A Live: Introduction to Diamonds
16:00
Unboxing Exotic Lab-Made Gemstones | Laser Rubies & More!
46:48
Three Precious Gems: Rubies, Emeralds, Sapphires
32:12
Wolfgang Grupp explodiert auf unserem Event
53:11