Frequently Asked Questions

Does the ultraviolet component of the light used for grading affect the color grade of the diamond?

GIA uses a standard set of lighting conditions for the color grading of all diamonds. The light source used is designed to simulate natural sunlight, which contains a component of ultraviolet radiation. In rare cases, a diamond can emit strong or very strong blue fluorescence when exposed to ultraviolet radiation—in such instances that fluorescence may temporarily and slightly affect its color appearance.

contact us

You are being redirected to GIA Alumni Association, LLC.