Answer:
I am a precious stone, as clear as a diamond. Though you can walk on water with my power, try to keep me, and I'll vanish in an hour. What am I?
What jumps when it walks, but sits when it stands?
I shoot but never kills
I travel in a gaggle.
At night I come without being fetched, and by day I am lost without being stolen. What am I?
What language does a billboard speak?