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Fluorescence

Fluorescence refers to a diamond's tendency to emit a soft colored glow when subjected to ultraviolet light. Roughly 30% of diamonds fluoresce to some degree. Of these, the most common colour is blue, but diamonds can fluoresce other colours. Overall, diamond fluorescence should not be a major factor in the purchase of a diamond since its effects are negligible.

There are 5 levels of diamond fluorescence described by the GIA: None (i.e. no fluorescence), Faint, Medium, Strong, Very Strong.



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