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.

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

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

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 ...

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 ...

Starting in May, many Sri Lankan dealers have traveled to Ethiopia to buy this material, causing steep price increases in local gem markets. All of the mining around Chila is artisanal, but large ...

We present an algorithm for enumerating all possible faceting arrangements of dihedrally symmetric diamond cuts. We first separate the question into enumerating crowns a ...

Basic, intermediate, and alkaline igneous rocks can sometimes also display similar pegmatitic textures. They include pegmatitic gabbro, syenite, and nepheline syenite, all of which are composed of ...