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Fluorescence in a diamond is a natural phenomenon that causes 35% of diamonds to glow under ultraviolet light. A diamond's fluorescence is not visible to the naked eye.
In most diamonds the fluorescence is seen as blue, but in rare cases can be green, yellow or orange.
Fluorescence is caused by the presence of nitrogen in the diamond and does not have any negative effect on the diamond.
Fluorescence in a diamond has no effect on the appearance of a diamond. In fact many people prefer the appearance of diamonds that have fluorescence in them.
Fluorescence in a diamond is another natural characteristic of the diamond. It is measured on the grading report on a scale ranging from none to very strong.
The exmaple below shows how diamonds with difference fluorescence levels would look under ultra violet lighting.