Answer:
What holds names and memories which are not its own?
What has three feet but no arms or legs?
What's a place you have left but didn't enter?
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
The person who makes it has no need for it. The person who purchases it does not use it. The person who does use it does not know he or she is. What is it?
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.