Provides a basis for analyzing colored coatings on a variety of polished gemstones.

Examines turquoise from northern China and identifies a geographic origin indicator to distinguish it from other Chinese sources.

A platinum necklace featuring 28 rare garnets won two 2023 AGTA Spectrum Awards.

Explores the journey of superdeep diamonds to the earth’s surface.

A graduate of GIA’s Jewelry Design program in Taiwan is the recipient of the 2023 Gianmaria Buccellati Foundation Award.

A CVD-grown diamond exhibits an interesting clarity characteristic.

An overview of the Spring 2024 Gems & Gemology content.

Learn about Texas topaz history and geographic origin research.

Discover a bicolor chameleon diamond, a diamond with carbon dioxide, and a pink square inside a diamond.

Learn all about the gems of Northern Madagascar in this exciting video with Wim Vertriest, GIA Manager of Field Gemology.

AGS and GIA Announce Joint Event for September 2025

 宝石・ジュエリー業界をリードする2つのイベントが、2025年9月に集結します

GIA is now offering printed AGS Ideal® Reports.

GIA is now offering printed AGS Ideal® Reports.

This reading list gives you an opportunity to learn more about the history of blue sapphires from Kashmir.

The story of the life and stellar jewelry career of William Ruser is brought to life in a newly published book

Recognizing the outstanding talent of GIA jewelry design students from around the world globally

Brandon H. Pace, an attorney with over two decades of legal experience in the financial and technology sectors, has been appointed by GIA