Answer:
Round as a button, deep as a well. If you want me to talk, you must first pull my tail.
A certain wizard resided in a city made from this gemstone.
What has six faces, But does not wear makeup. It also has twenty-one eyes, But cannot see?
A precious stone, as clear as diamond. Seek it out whilst the sun's near the horizon. Though you can walk on water with its power, Try to keep it, and it'll vanish within an hour.
My first is twice in apple but not once in tart. My second is in liver but not in heart. My third is in giant and also in ghost. Whole Iām best when I am roast.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.