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Fluorescence

Fluorescence

About one third of diamonds emit light when exposed to ultraviolet (UV) light. The radiation energy in the light interacts with the diamond's atoms and causes it to glow. The glow is usually blue but can be of any color. The sun emits UV rays, so natural sunlight can cause diamonds to fluoresce. Diamonds are graded on their fluorescence on a scale from faint to very strong.

Fluorescence can enhance or detract from the beauty of a diamond. The bluish tint can improve a lower-color diamond (J-N color for example) by canceling out the faint yellow, resulting in a colorless appearance. However, in a high-color diamond (D-F color for example), fluorescence may have the opposite effect.