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In the early 1800s sunstone was a little-known, rare, and costly gemstone. It wasn’t until finds in Norway, Siberia, and other parts of the world that sunstone became somewhat more widely recognized, more available, and less expensive.

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

Peridot is the gem variety of the mineral olivine. Its chemical composition includes iron and magnesium, and iron is the cause of its attractive yellowish green colors.

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

Learn about the factors that make sunstone so desirable.

与来自中亚其他矿床的红宝石和粉红色蓝宝石做初步检查和比较。

An exploration of the distinction between jadeite and omphacite, plus GIA's current policy concerning the definition of these stones.

他是一位杰出的教育家，他传授美国宝石研究院的第一个海外课程，并后来担任研究院院长和 Governor for Life（终生管理者）。

对市场存在的铍处理过的蓝宝石及其识别特征的更新。 这里还描述了两件大颗粒样本（22 克拉和 53 克拉）。

介绍了对产自美国、墨西哥和中国的淡黄色长石进行的热处理和铜漫射试验结果。

最近讨论的铜扩散电气石存在性促使实验室探究这种可行性。