Cultured vs Natural Pearls by DANAT, Bahrain Institute of Pearls and Gemstones
59:58
An Overview of Pearl Identification Techniques | GIA Knowledge Sessions Webinar Series
53:23
DANAT: Bahrain Institute of Pearls and Gemstones
1:12:00
Gem-A Live: Man-made Stones Explained
1:15:46
X-Rays and Their Use in Gemology | GIA Knowledge Sessions Webinar Series
22:46
All About Cultured Pearls - Deep Dive with Pearl Expert!
1:11:32
Gem-A Live: Understanding Gemstone Species and Varieties
9:31
Why South Sea Pearls Are So Expensive | So Expensive | Business Insider
58:56