Answer:
I am a precious stone as clear as diamond. Seek me out while the sun's near the horizon. Though you can walk on water with my power try to keep me and I'll vanish in an hour.
Railroad Crossing, look out for the cars. Can you spell that, without any R's?
The more you take away the bigger I get. What am I?
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain; doing no harm, and feeling no pain. What am I?
I fly when I'm on and float coming off.
The answer I give is yes, but what I mean is no. What was the question?