This is the $137 Skull & Brain Friendship Necklace Set designed by Monserat De Lucca. You and your best friend each wear one of the pieces (I call dibs on the skull), then when you get together you put the brain inside the skull and have to walk really close to each other! Just kidding, you don't have to do that. Don't have a best friend? Just wear both yourself. Don't have a neck? Lay off the steroids. Don't have $137? Welcome to the club, we meet at the gas station and spend what little money we do have on lottery tickets and beer.
Thanks to lilco, who agrees a matching necklace set is an important part of any BFF relationship.