1:19:22GemQuest February 2026 - Fluorescence Techniques in Identifying Diamonds and GemsCSGemstones54 views·1 month ago
1:00:07Gemquest October 2025 - The Gemstone Collection of the American Museum of Natural HistoryCSGemstones213 views·5 months ago
1:04:46Gemquest August 2025 - synthetic diamonds & Color and ChemistryCSGemstones50 views·5 months ago
1:21:06Gemquest January 2025 - The Nomenclature of Garnets and how to identify themCSGemstones95 views·1 year ago
1:27:36Gemquest November 2024 - A quick and dirty course in how to use portable tools in gemologyCSGemstones48 views·1 year ago
1:01:07Gemquest - a walk through the Natural History Museum London with Robin HansenCSGemstones249 views·1 year ago
1:12:38Gemquest Gemstone photography – setting your stones into the right lightCSGemstones995 views·2 years ago
1:07:51Gemquest Treatment for Colored Stones- tourmaline, topaz & tanzaniteCSGemstones928 views·2 years ago
