Answer:
I am a portal to another world which you cannot enter. Only you can see me but I can't see you.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.
I am a nut with a hole
They took me from my mother's side where I was bravely bred and when to age I did become they did cut off my head. They gave to me some diet drink that often made me mad but it made peace between two kings and made two lovers glad.
What do you get when you cross a snowman with a vampire?
As round as an apple. As deep as a cup. All the king's horses can't pull it up.