蓝宝石英文名 sapphire在aigs证书identification定名对应栏natural
文对照与解释:grs-gemresearch swisslab 瑞士寶石研究實驗所gemstone
英文原版 gem identification made easy 6th edition 宝石鉴定一点通
科普灰色akoya辐照改色是怎么回事
gemstone identification.
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