Answer:
What goes in, but never through? I've got some and so do you. We might lend one, or even two, but only if our trust is true.
Some try to hide, some try to cheat. But time will show, we always will meet. Try as you might, to guess my name. I promise you'll know, when you I do claim.
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.
They have not flesh, nor feathers, nor scales, nor bone. Yet they have fingers and thumbs of their own. What are they?
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
When is it bad luck to see a black cat?