Sally Eaton-Magaña, Christopher M. Breeding, and James E. Shigley ...

Your name or store info is removed so grading is completely unbiased. Every pearl or pearl strand, whether from a local jeweler or a globally recognized brand, is evaluated using the same rigorous, ...

Fluorescence and phosphorescence can assist in revealing whether a gemstone is natural, laboratory-grown or treated. GIA developed this guide so retailers can use fluorescence tests to help identify ...

Explore aquamarine history, research, quality factors, and more in the GIA Gem Encyclopedia.

Download the latest issue for articles about gemology and jewelry design, interviews, education program descriptions, schedules and more.

Pezzottaite, ideally Cs (Be 2 Li)Al 2 Si 6 O 18, is a new gem mineral that is the Cs,Li–rich member of the beryl group. It was discovered in November 2002 in a granitic pegmatite near Ambatovita in ...

An Identification Report, with geographic origin added. For polished, loose or mounted natural alexandrite, demantoid, emerald, jade, opal, Paraíba tourmaline ...

The quarterly journal of the Gemological Institute of America.

Field reports, videos, photography, and firsthand accounts from mines and industry hot spots around the world.

The quarterly journal of the Gemological Institute of America.

Designed for clients who seek in-depth insights into every aspect of a jewelry item. Comprehensive analysis of the diamonds in an item, including number of stones, shape, estimated carat weight, color ...

Field reports, videos, photography, and firsthand accounts from mines and industry hot spots around the world. Search GIA's library catalog of 65,000 books, 230,000 images, 2200 videos, 1200 ...