Fluorescence:

Fluorescence (a variety of luminescence) is the light radiation due to a reaction of the material atoms when exposed to incident light.
Emission of light by a diamond when exposed to ultraviolet radiation is termed as Fluorescence.In better colors presence of Fluorescence reduces the Brilliance of the stone while in weaker colors presence of Fluorescence adds more Brilliance to the stone.
We grade Fluorescence as follows:

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We do provide Fluorescence Color also if any.
Fluorescence colors like White, Blue, Yellow, Green, and Orange are having direct impact on the overall color of the diamond.
Depending on the nature and type of bonds that other elements form With Carbon atoms of a diamond crystal, fluorescence can be of different colors.