it's a fleeting thing i notice now and again, a periwinkle blue glow to the stone when in certain fluorescent lights or outside. It's pretty and it's cool. It's different. i tend to see it when i'm driving in the car.
When I have my diamond in sunlight it makes my eyes hurt to look at it, it's so bright and crazy looking with the glow and the sparkles.
In my limited amateur experience of seeing about 6 fluorescent diamonds is that they took my breath away.
there is a huge stone in the smithsonian museum that has a transparency problem, it is also strongly fluorescent. it is called the Portuguese diamond. Now That IS a cloudy fluorescent stone.