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Carotene will fluoresce in UV light, but the "colour" of the fluorescence is infra red and cannot been seen by the human eye.
Conflict diamonds are called such based on how they are mined -- by humans at gunpoint or under threat of death or dismemberment. Diamonds mined this way can be of any colour, including brown.
Gem-quality diamonds sparkle under any available light, even moonlight, starlight, firelight and flashlight.
It will be green
The Latin prefix 'infra' means 'under', as in infrastructure, infrared, infra dig, inferior, etc.
If the diamond has natural fluorescence -- about 60% of diamonds do -- then, yes, it will glow under black light.
brown
it will be black
White.
blue
Black.
BLUE