Answer:
A seed am I, three letters make my name. Take away two and I still sound the same.
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.
Where do you go in through one hole and come out through two holes at the same time?
It's in your hand though you can not feel it. Only you and time can reveal it.
I am nothing really at all, Yet I am easily foundΝΎ Ignore me at your own peril, and you might end up crowned!
Iβm grown from darkness but shine with a pale light. Very round I am and always a lady's delight.