Последние добавленные видео:
Gem-A
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4 years ago
30185 4 years ago 7:09Gem-A education: How to use the polariscope
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4 years ago
273233 4 years ago 1:11:32Gem-A Live: Understanding Gemstone Species and Varieties
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4 years ago
27690 4 years ago 51:31Gem-A Live: Introduction to Diamonds
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5 years ago
3851 5 years ago 6:18Gem-A Graduates
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4 years ago
26531 4 years ago 1:11:00Gem-A Live: Fluorescence
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4 years ago
11503 4 years ago 1:04:08Gem-A Live: Fracture Filling in Gemstones
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3 years ago
4220 3 years ago 1:26Welcome to GemIntro, Gem-A's online entry-level qualification
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5 years ago
32676 5 years ago 5:33Gem-A education: How to use the 10x loupe
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4 years ago
10768 4 years ago 3:51Gem-A education: How to use the conoscope
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4 years ago
17145 4 years ago 4:36Gem-A education: How to use the London dichroscope
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1 year ago
692 1 year ago 4:36Gem-A Conference 2023
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4 years ago
29260 4 years ago 9:48Gem-A Education: How to use the refractometer
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4 years ago
44351 4 years ago 1:12:00Gem-A Live: Man-made Stones Explained
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4 years ago
2053 4 years ago 41:44Gem-A Live: In Discussion with the Editor of The Journal of Gemmology, Volume 37, No. 4
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3 years ago
1500 3 years ago 58:08Gem-A Live: In Discussion with Editor of The Journal of Gemmology, Volume 37, No. 5
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1 year ago
909 1 year ago 3:56Gem-A Conference 2022