Frequently asked questions

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

GIA uses a standard set of lighting conditions for the colour 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 colour appearance.

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