Answer:
Lovely and round, I shine with pale light. Grown in the darkness, a lady's delight. What am I?
There are four of us but it seems like everyone loves spades the most.
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. Sooner or later everybody needs my help yet many people are afraid to let me help them.
I am always hungry I must always be fed. The finger I lick will soon turn red.
Two in a whole and four in a pair. Six in a trio you see. Eight's a quartet but what you must get is the name that fits just one of me.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.