Two-phase inclusions are investigated in alluvial sapphires from deposits in Montana.

Two new deposits of Cu-bearing tourmaline have been found in Paraíba State, Brazil, not far from the original source at Mina da Batalha.

Primary and secondary deposits in the Tan Huong–Truc Lau area of northern Vietnam’s Yen Bai Province have supplied rubies and some sapphires for more than a decade.

Since 2002, tsavorite and other grossular varieties have been recovered from a primary deposit at Itrafo, a village in the Andrembesoa area of central Madagascar.

Over the last decade, Pakistan has developed into an important source for many gem materials. A number of localities have been identified for emeralds in particular.

Investigating a set of six antique brooches set with diamonds and light blue cabochons.

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

人们通常认为石榴石是深红色的宝石，但它也可以是黄色、橙色、绿色或棕色——除了蓝色以外的任何颜色。

GIA 钻石原产地鉴定服务依靠参与的矿业公司、制造商、批发商和零售商，确保向最终消费者提供已确认原产国且已经过专业分级的天然钻石。通过提供以下列表，我们鼓励整个供应链中的公司在为客户采购获得 GIA 钻石原产地鉴定证书的钻石时，彼此多多交流。

纯净的锆石虽然无色，但通常呈黄褐色至棕色。它也存在红色、蓝色、紫色和绿色等颜色。由于其高亮度和高色散性，无色锆石有时被用作珠宝中钻石的替代品。

GIA 的使命是确保公众的信任。研究院领导层包括理事会、管理人员、全球鉴定所及校区总监。

A diamond with a previously unseen clarity characteristic is seen in GIA’s Carlsbad lab.

World-renowned gem identification expert who guided GIA's lab services to the forefront of gemological research.

世界著名的宝石鉴定专家带领美国宝石研究院 (GIA) 鉴定所 的服务走在宝石学研究的最前沿。

下载 GIA iD100 宝石检测设备的用户指南。

This document provides the publication information for Gems & Gemology

This document provides the publication information for Gems & Gemology

This document provides the publication information for Gems & Gemology