This beautiful black tourmaline comes on a gold plated, adjustable ring for an easy and comfortable fit.Black tourmaline is a powerful all-round stone for protection and is a must have for your collection. It's probably the best crystal for repelling negative, lower energies and frequencies, or for encouraging a more positive emotional attitude. Black tourmaline is also said to protect against EMF and geopathic stress.*This adjustable design allows for the fitting of majority ring sizes. One size fits most.*