Hoop, stud, diamond or pearl, these make a nice gift for your girl.

I hide the world, then let it through, With just a pull, I change the view. On stage or window, I may fall, what am I, soft divider for all?

I'm used to build a dragon's hide, Or to give an idea of size, Lady Justice holds me high, I'm the ascension notes go by

When walls said, keep out, I took offense. I answered back in the airborne sense.

This tool helps fix up teeth, Or create tunnels for mining, Though exercises named by this May need some refining