Carlin stone is a very hard and shiny rock that comes from the earth. It looks really fancy and special, like something a princess might wear in her crown. People sometimes use carlin stone to make jewelry because it's so pretty. But one thing that makes carlin stone really special is that it's very rare. That means you can't just find it anywhere - it's kind of like a treasure that you have to search really hard for! Sometimes people call it "golden treasure" because it's such a valuable and rare precious rock.