Silver

Silver is associated with the moon, further more also associated with the yin and feminine energies.

As the metal is reflective, as the moon reflects the light of the sun, so does silver reflect negativity from the wearer.

You can wear sliver jewelry for magical security; to provide protection against evil intent, as it reflects spells of harm back to the sender.

Is the metal of emotions, of the psychic mind, and of loving as well as healing.
When you use silver is with gemstones, the metal retains and amplifies the qualities emitted by the stones. It will enhance the connection between you and the stone, allowing for a gentle flow of energy between you two.