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宝石改善
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宝石改善
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gemstones enhancement
宝石改善
运用某种技术方法和处理工艺,改善宝石的外观(颜色、净度或特殊光学效应)、耐久性或可用性,从而提高宝石美学价值和商品价值的过程(不包括对宝石进行切磨、抛光、雕刻和镶嵌等加工方法)。
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Three Zhus of Jiading school
Threlfall
threo configuration
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thresher for rice-wheat
thresher sharks
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