The History of Engagement Rings | GIA Knowledge Sessions Webinar Series
5:42
The History of Wedding & Engagement Rings
49:36
The Diamond Story
59:03
关于锂紫玉及其他粉红色宝石的宝石学研究 | GIA 知识交流
6:16
Do Lab-Grown Diamonds Test As Real Diamonds?
3:35
History of Engagement Rings
1:03:27
第39回 GIA Tokyo GemFest: スピネルの歴史と科学
2:31
Why Do We Put Diamonds On Engagement Rings?
7:34