Answer:
My teeth are sharp, my back is straight, to cut things up it is my fate.
A hill full, a hole full, yet you cannot catch a bowl full.
Tool of thief, toy of queen. Always used to be unseen. Sign of joy, sign of sorrow. Giving all likeness borrowed.
You saw me where I never was and where I could not be. And yet within that very place, my face you often see.
Two horses, swiftest traveling, harnessed in a pair, and grazing ever in places. Distant from them.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.