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?
The dirtier I get, the whiter I am. What am I?
Never resting, never still. Moving silently from hill to hill. It does not walk, run or trot. All is cool where it is not. What is it?
You throw me away, I find my way back. Traditionally, I'm wooden with an arch in my back. What am I?
I will disappear every time you say my name.
When is it bad luck to see a black cat?