Seashell Compass/Pocket Watch

Just like what the merpeople use!!!
I was bored and needed something to do with some of my Great Grandmother's seashells (I love her, may she rest in peace but she had way to many seashells.)
Then I remembered my seashell locket and thought I could make another one but with real seashells! But I didn't think of what should go inside until after I prepared and paired more then half of them. So I decided to make a "pocket watch/compass"
I think it's kind of funny, because then I started thinking about what would a mermaid put in a locket since photos don't last long underwater.