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.
He has one and a person has two. A citizen has three. And a human being has four. A personality has five. And an inhabitant of earth has six.
Be sure to shout for its answers are weak, but there is no language it cannot speak.
Through its wounds, water does run. It once held many but now has none. What is it?
Goes over all the hills and hollows. Bites hard, but never swallows.
You can always find me in the past. I am created in the present, but the future can not change me. What am I?