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Gemological Institute of America
4 天
GIA 珍珠研究
珍珠历来受到众多文化珍视,常被誉为“宝石皇后”,长久以来一直是珠宝行业乃至全球范围内最受追捧的宝石之一。其独特外观与市场上养殖珍珠的实惠价格,令其人气指数多年来呈指数级增长。 珍珠产自多种软体动物,主要来自双壳纲与腹足纲,通过类似于 ...
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