It is a ring.
She wears it on a leather cord around her neck, a delicate band, the wood ash gray, and smooth as polished stone. He carved it when she was born, made for the girl she’d one day be, and Adeline wears it like a talisman, an amulet, a key. Her hand goes to it now and then, thumb running over the surface the way her mother’s runs over a rosary.