Answer:
Often held but never touched. Always wet but never rusts. Often bits but seldom bit. To use it well you must have wit.
My first half is normally made of stone, my second is crazy, and I taste sweet when complete.
I can be moved. I can be rolled. But nothing will I hold. I'm red and I'm blue, and I can be other colors too. Having no head, though similar in shape. I have no eyes - yet move all over the place.
What asks but never answers?
Two little holes in the side of a hill. Just as you come to the cherry-red mill.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.