在钻石贸易中，“光效应”一词广为使用，但实际观察钻石时，“光效应”到底指的是什么？

Russell Shor（罗素·肖尔）对多年来他所报道的行业新闻中遇到的人、见到的宝石和听到的故事的思考。

不要单凭颜色来判断黄色宝石。从钻石、黄水晶再到柘榴石，很多宝石也呈现黄色色彩。

了解莫桑比克红宝石的开采历史、特征和市场需求等信息。

Color stability experiments show that the color of Queen conch shell and pearls may shift in hue and/or saturation under X-ray radiation or short-wave UV radiation.

关于卡拉拉大理石的加注文献清单

加利福尼亚州卡尔斯巴德 — 2020 年 2 月 26 日 – 新发现的矿物种别 Dutrowite 属于碧玺族，与 GIA 理事 Barbara L. Dutrow（芭芭拉·L.·达特罗）博士同名。

冠状病毒对中国大陆及香港的经济影响。以及钻石市场和黄金首饰的最新资讯。

近日，GIA 科学家展示了他们在钻石标记以及钻石灰-蓝-紫颜色成因方面的最新研究成果。

加利福尼亚州卡尔斯巴德 — 2020 年 2 月 3 日 — 最新一期的 GIA 专业季刊《宝石与宝石学》(Gems & Gemology) 2019 年冬季刊集中讨论了宝石学鉴定所有色宝石地理原产地鉴定的科学原理、问题和限制。

The relative chemical diversity of emeralds from different deposits worldwide allows clear origin determination in most cases. This contribution explains the criteria used by GIA to make geographic origin conclusions for emeralds.

Over the last two decades, knowledge of the formation of gem deposits has improved significantly. This article reviews the state of our knowledge of the geology and genesis of gem corundum and emerald deposits.

Geographic origin determination relies on a combination of gemological observations and advanced analytical tools. This contribution reviews the analytical methods commonly used to establish origin.

Copper-bearing gem tourmaline, known as Paraíba tourmaline after the location of its original discovery, is prized for its vivid blue to green color. This article explains GIA’s use of quantitative chemical analyses to distinguish samples from Brazil, Nigeria, and Mozambique.

An overview of the geographic origin complexities facing the gem and jewelry industry today.

自2008年以来，GIA已在六大洲开展了90多次实地考察，积累了超过22,000件彩色宝石参考样品。这些来源明确的彩色宝石藏品为GIA的地理产地鉴定研究提供了有力支持。

The world ruby market has undergone dramatic change in recent years, especially with the development of ruby mining in Mozambique. This contribution outlines GIA’s methods and criteria for establishing the geographic origin of ruby.

The geographic source of this rare color-change gem has a significant impact on value. Trace element chemistry profiles allow GIA to accurately determine origin for alexandrite from several countries.

A look ahead to the future of geographic origin determination.