For this you will need a pentagram pendant and a bowl of salt water. Holding the pendant in your left hand and the bowl of salt water in your right, turn to the West. Slowly pour the water over the pendant as you speak the following charm:
Elements of earth and sea
Return to all by power of three.
That which may be sent to me
Unless I have summoned it to be.
I am protected from this night
By the spirits of power and might.
Wear the pentacle for protection on a daily basis. Once a month, at the dark of the moon, repeat the charm to keep your pentacle properly charged.
source: [You must be registered and logged in to see this link.]