Gemquest / Gemstone photography – setting your stones into the right light
1:13:23
Gem Quest - Gem cutting in the 21st century
1:01:07
Gemquest - a walk through the Natural History Museum London with Robin Hansen
1:29:04
Bevil Templeton-Smith - Microscopic Visual Adventures
13:14
What is a Vogel-Eredyon Crystal Wand?
2:11
Speaking of Stones: Unlocking Gem Secrets with Infrared Spectroscopy.
1:31:13
James Wright - Historic Buildings and Mythbusting
13:20
Make a double wall bowl
5:36