Answer:
I look at you, you look at me, I raise my right, you raise your left.
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain. Doing no harm, and feeling no pain.
You’ll have me at night and if you remove the first letter I denote the top, such as on a train
If you break me, I do not stop working. If you touch me, I may be snared. If you lose me, nothing will matter.
I work when I play and play when I work.
I’m grown from darkness but shine with a pale light. Very round I am and always a lady's delight.