Answer:
Lovely and round, I shine with pale light, grown in the darkness, a lady's delight.
Some live in me, some live on. And some shave me to stride upon. I rarely leave my native land. Until my death I always stand. High and low I may be found. Both above and below ground.
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.
I hide but my head is outside.
What's as small as a mouse but guards a house like a lion?
What is so fragile that saying its name breaks it?