Overview of Ethics and Compliance Programs at GIA

The color grade of most gem-quality diamonds is based on the absence of color.

We often think of a diamond's cut as shape, but a diamond's cut grade is really about how well a diamond's facets interact with light.

Subscribe to GIA’s Knowledge Rocks — emails containing nuggets of wisdom about gems, jewelry and field gemology.

Additional information required from an authorizing agency to enroll a client in GIA programs.

Experience the cutting-edge of gemology at Jewellery & Gem WORLD Hong Kong. Explore the latest from GIA, including instrument demonstrations, on-site laboratory services, colored stone grading services, and more. Plus, don’t miss our Emerald Experience Corner at GIA’s main booth at HKCEC!

Diamond clarity refers to the absence of inclusions and blemishes.