Glossary Blog » American Gem Society

A microscopically crystalline variety of quartz forming in almost transparant to translucent masses...

A gemologist is a title granted by a gemological institute such as the American Gem Society (AGS) or the Gemological Institute of America (GIA)

Carbon is an element. Diamond, graphite, and carbon black are all carbon; the carbonates, like calcite, contain some carbon in combination with other elements.

Brilliant. A definition. A type of gem cutting used especially on diamonds with...