Learn about the factors that make kunzite so desirable.

Typically, turquoise is judged on three basic quality factors: color, texture and the presence or absence of matrix. Learn more about turquoise and what makes this gem so sought after!

Many people have heard of zircon but never seen it. This is mostly because of colorless zircon’s wide use as a diamond simulant in the early 1900s.

Jade has been cherished through the centuries. To the Chinese it is the

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。

五十年来一直在位于 47 街的 GIA 纽约鉴定所担任副总裁兼总监。

回顾 G·罗伯特·克劳宁谢尔德的开创性研究

介绍几种用玻璃处理的红宝石，对这些玻璃处理的红宝石进行实验研究，验证该石头为玻璃粘结物。

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。

GIA 第一位女性宝石学家及行业先锋。

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）。

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

Kunzite is a relative newcomer to the array of colored stones available for use in jewelry.

了解堇青石的耐用性以及如何保养您的堇青石首饰。

爱德华·古柏林博士收集的藏品中，有许多来自世界各地不常见的宝石。

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

Learn about the factors that make iolite so desirable.

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