Answer:
I am the tool for inspiring many. Buy me in the store for not much more than a penny. Don't overuse me, or my usefulness will go. What am I?
Teenage girls are pros at creating me. Learn me in classes.
I am seen in the water. If seen in the sky I am in the rainbow a jay's feather and lapis lazuli.
Keep doing me to avoid lens dryness
Squeeze me and I cry tears as red as my flesh, but my heart is made of stone. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.