人工合成钻石的鉴定方法 | GIA 知识交流
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58:27
深入了解蓝宝石: 处理与产地 | GIA 知识交流
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1:04:54
Furnaces, Fluxes and Filling: A Review of Ruby Treatment | GIA Knowledge Sessions Webinar Series
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56:05
尖晶石概览: 处理与产地 | GIA 知识交流
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12:46
💎 How To Tell A Fake Or Real Diamond! I Spot A Cubic Zirconia, Moissanite, Lab & Earth Diamond
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1:15:02
VKC talk by Branko Deljanin | 13 February 2025
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57:24
Diamond Color Treatment and Its Identification | GIA Knowledge Sessions Webinar Series
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1:10:44
深入讨论红宝石的各方资讯
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57:00