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| | FLUORESCENCE
Fluorescence in diamonds is the emission of visible light from a diamond that occurs during exposure to any type of ultraviolet (invisible) light. Fluorescence is almost always seen as a blue glow emanating from within the diamond. About half of all cut diamonds contain fluorescence.
The best way to see fluorescence is under a pure black light (long wave ultraviolet light) enclosed in a dark box. Under this light, almost all diamonds containing fluorescence will exhibit various intensities of a blue glow. The more fluorescence the diamond contains, the stronger the blue glow will be.
Fluorescence in diamonds is also exhibited in both sunlight and fluorescent lighting because these light sources contain ultraviolet light (UV). However, because fluorescent tubes and sunlight emit mostly visible light, along with ultraviolet light, it is very difficult to see any of the blue glow in diamonds containing fluorescence. What you do see under sunlight and fluorescent tubes are the effects (both good and bad) of fluorescence on the diamond.
Another light that diamonds are commonly viewed in is incandescent light. Most light bulbs used in the home are forms of incandescent light. Incandescent light is not a good source for observing fluorescence in diamonds because it contains little or no ultraviolet light.
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