A reference library covering natural gemstones and minerals, synthetic and treated gems. Also offers resources for people who would like to pursue a career in gemology.
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Musharof Chy•2025/02/21•1 分钟阅读•12 个月前更新
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A reference library covering natural gemstones and minerals, synthetic and treated gems. Also offers resources for people who would like to pursue a career in gemology.
Musharof Chy•2025/02/21•1 分钟阅读•12 个月前更新
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