1. Like a grade in school, a rating given to a feature in diamonds or other gems.
(verb) 2. To measure a gem's special feature (like clarity) using an established grading scale.
view the glossary


With your trusty loupe and your critical eye, you uncover the story behind gems, jewelry and watches...
see more careers

In The Classroom

Guides and instruction for all things GIA and gemology.
Browse Classroom Materials

more to see and do