Answer:
Sometimes I am white, sometimes I am dark. Most people love me. What am I?
What has 13 hearts but no other organs?
What goes up and down but does not move?
I am a precious stone as clear as diamond. Seek me out while the sun's near the horizon. Though you can walk on water with my power try to keep me and I'll vanish in an hour.
Lovely and round I shine with pale light grown in the darkness a lady's delight.
What never gets any wetter no matter how hard it rains?