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Fluorescence is the reaction of a diamond under UV rays. This phenomenon can be observed on around 30% to 40% of diamonds. An electric color, most often blue, arises from the stone under a UV lamp.

 

Diamonds of color D-E-F with a lot of fluorescence will have a milky appearance under natural light

Diamonds of color I-J and beyond that exhibit fluorescence may have their yellowish color substantially attenuated.

None ou Nil 

Faint            

Medium           

Strong            

Very strong