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珍珠描述
Perhaps the best-loved gems of all time, pearls—both natural and cultured pearls—occur in a wide variety of colors. Learn about the factors that make pearls so popular and desirable!
Abstracts; Fall 1991
本文摘自《宝石与宝石学》(Gems & Gemology) 1991 年秋季刊,是《宝石与宝石学》(Gems & Gemology) 外部发表的重要宝石学相关文章的摘要汇编。






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