"Let's Read & Talk about Gemology" with Antoinette L. Matlins
1:44:16
Let's read & talk about Gemology with Richard W. Hughes, author of "Ruby & Sapphire"
2:06:08
"Let's Read & Talk about Gemology" with John I. Koivula
17:49
Field Gemology Case
12:30
Le trésor que nous avons trouvé a choqué le monde ❗️ Chasse au trésor avec un détecteur de métaux.
1:56:37
«The Evolution of the Gems & Jewelry Supply Chain», a gemology webinar with Jean Claude Michelou
1:59:52
Let's read & talk about Gemology with Jean Claude Michelou, Editor in Chief of "InColor" Magazine.
2:42:18
«Geology of Gems: 30+ years of a fascinating Scientific & Human Adventure », with Gaston Giuliani
2:10:14