The extra earring(s) women wear to let you know they aren't mormon. This is because mormons are only allowed to wear "one modest pair of earrings." If ever in doubt as to whether or not a girl is mormon, look for the extra earring(s).
I was totally hitting on that girl from the coffee shop the other day, but I saw she had an I'm not mormon earring.. I can only date mormons, so I ran away.