Answer:
A precious stone, as clear as diamond. Seek it out while the sun's near the horizon. Though you can walk on water with its power, try to keep it, and it'll vanish in an hour.
What has roots as nobody sees, is taller than trees. Up, up it goes, and yet never grows?
What instrument can make any sound and be heart, but not touched or seen?
I work when I play and play when I work.
If you spot one of these eastern warriors, they're not doing their job right.
What covers its face with its hands, speaks no language, yet most known what it's saying?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?