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Learn about the factors that make ametrine so desirable.

在通用电气于 1971 年制成第一颗宝石级合成钻石时，公司首先将它们送到了 GIA 进行检验和研究。 44 年后的今天，GIA 研究人员密切跟踪了这些实验室培养的钻石的发展 - 从早期实验到市场的商业量化生产。

A pioneer in the field of photomicrography and the study of inclusions led to groundbreaking changes in the study of gems.

For more than 30 years, the beauty of science has found expression in every issue of Gems & Gemology, thanks in large part to one influential editor and innovator, Alice Keller.

A researcher, author, and instructor regarded as a

作为一位艺术家和宝石学家，他的研究影响了行业对彩色钻石的理解。

Renowned teacher, master of gem identification, and developer of gemological techniques and instruments.

他是宝石学家、教育家，并自称为梦想家。他建立了研究院的研究部门，并成立了世界知名的国际宝石学专题研讨会。

GIA 有色宝石服务全球总监为宝石材料和处理工艺的鉴定提升宝石学标杆。

Learn about spinel's durability and how to care for your spinel jewelry.

Individual opals are as diverse as snowflakes or fingerprints and can vary widely in appearance and quality. Learn about the factors that make opals so desirable!

Not all feldspars that bear the name “sunstone” are from the same side of the feldspar family—both the orthoclase and the plagioclase species boast a sunstone feldspar variety. The name sunstone refers to the gem’s appearance rather than to its chemical makeup.