In Santería and Afro-Cuban traditions, Jet and the Saint Lucy's Eye are two of the most powerful and widely used protective amulets to ward off the evil eye (negative energies, envy, or ill wishes).
Jet
It is a stone of organic origin (a variety of coal) that is used as a shield against dense energies and envy.
Saint Lucy's Eye
It refers to the operculum (the calcified "lid") of a sea snail. It represents the eyes of Saint Lucy, the patron saint of sight