Fluorescence >>
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Diamond's weight is measured in carats.

Fluorescence is the emission of energy during exposure of the diamond to ultraviolet light. Fluorescence stops when the radiation stops. 

Not all diamonds have fluorescence (only 50% or so).

If the stone doesn’t have fluorescence it does not mean that this is not a diamond, but if the stone does have fluorescence it is certain that it`s a diamond
Fluorescence will generally be in shades of blue, purple, but there are other Fluorescence sectors like green, yellow and more.
There are four levels of common Fluorescence:

• None
• Faint
• Medium
• Strong