Видео с ютуба Knowledge Sessions

Fascinating World of Pearls and Shells | GIA Knowledge Sessions Webinar Series

Natural Blue Diamonds | GIA Knowledge Sessions Webinar Series

Geology 101: Natural Processes that Form Colored Gemstones | GIA Knowledge Sessions Webinar Series

The Science Behind Fancy Color Diamonds | GIA Knowledge Sessions Webinar Series

Natural Pink Diamonds | GIA Knowledge Sessions Webinar Series

Rubies: Connecting Sources, Treatment and Science | GIA Knowledge Sessions Webinar Series

Tools of the Trade | GIA Knowledge Sessions Webinar Series

Geology 102: Natural Processes that Form Colored Gemstones | GIA Knowledge Sessions Webinar Series

Red Gemstones: History, Lore and Gemology | GIA Knowledge Sessions Webinar Series

Identifying Mineral Inclusions in Diamonds | GIA Knowledge Sessions Webinar Series

Untold Stories from GIA Field Gemology Expeditions (Part II) | GIA Knowledge Sessions Webinar Series

A Look at Kimberlites: The Volcanoes that Carry Diamonds | GIA Knowledge Sessions Webinar Series

The Sapphires of Montana | GIA Knowledge Sessions Webinar Series

Playing the Blues: An Overview of Sapphire Treatment | GIA Knowledge Sessions Webinar Series

Interesting Discoveries from the GIA Laboratory | GIA Knowledge Sessions Webinar Series

The History of Engagement Rings | GIA Knowledge Sessions Webinar Series

The Unique Story of Natural Diamond | GIA Knowledge Sessions Webinar Series

Understanding the Origin of Natural Diamonds | GIA Knowledge Sessions Webinar Series

Sapphires: From Ceylon to Ethiopia | GIA Knowledge Sessions Webinar Series

Rough Diamonds: Natural Crystal Shapes & Surface Features | GIA Knowledge Sessions Webinar Series