Do you know where pearls come from? They come from oysters. An oyster is a shellfish that lives in the ocean. They have a very hard shell that protects them, but sometimes something like a small grain of sand can get inside the shell and it causes a lot of pain and discomfort for the oyster.
God has given the oyster a way to ease that pain. When a grain of sand gets in there, the oyster oozes out a liquid that coats the grain of sand and then it hardens. The oyster keeps doing this over and over until the grain of sand no longer causes pain. This is how these pearls are made. Something that started out being painful turned into something very beautiful and valuable.
The same thing happens to us. Sometimes something comes into our life that causes a lot of hurt and pain. When that happens, God gives us something to help ease the pain. He gives us His love. If we ask Him to, He will ooze out His love to ease our pain and suffering. Often what started out to be very painful in our life can turn into something beautiful. (source: www.sermons4kids.com/pearls.html)