Who is the left brain and who is the right brain? It’s fun to decide who is who with these matching brain friendship necklaces. Or if you’d rather just have a half brain for yourself, you can buy one necklace for you. The brain pendants were completely carved by hand, including interior details on the dissection. It’s not anatomically correct, but it is still pretty dang detailed. The charms are solid bronze, and the chains are 14k gold-filled and 18 inches long. You may add an extender here if you like a longer necklace. The set includes two opposite halves of a brain that match up when placed together.