The Gemological Institute of America (GIA)
GIA is the creator of the famous “4 C’S” of diamond grading and value (Cut, Clarity, Color and Carat weight); to learn more, visit
What Is GIA? A Tradition of Science and Education
Established in 1931, the Gemological Institute of America is the world’s foremost authority on diamonds, colored stones, and pearls.

GIA Aliumni Chapters and Officers

The National Association of Jewelry Appraisers (NAJA)

The Association’s primary purpose is to recognize and make available the services of highly qualified, informed, experienced, independent, and professional appraisers of gems and jewelry to those members of the public requiring such expertise.

American Gem Trade Association (AGTA)

AGTA is the authority in color for the jewelry trade setting a code of ethics and standards for dealers and wholesalers.

Jewelers Mutual
Jewelers Mutual is an insurer that specializes in jewelry insurance for the trade and individuals.

GIA Interactive Learning Tool
Learn all about the GIA 4Cs of diamond quality – Color, Clarity, Cut and Carat Weight – with their interactive learning tool.

How to Choose a Diamond: The GIA Grading Video

Long Version – 10 minutes
Short Version – 5 minutes
M4V (16.3MB)
M4V (7.7MB)
Windows Media Player
WMV (26.6MB)
WMV (14.4MB)
(Right-click links and “Save As…” to download)

GIA Podcasts
Download GIA Diamond Grading Report Podcast
For Apple, QuickTime and iPod
For Windows Media Player

Download Explaining Synthetic Diamonds Podcast
For Apple, QuickTime and iPod
For Windows Media Player

Monex Precious Metals Chart