Protects from all dangers and evil spirits. Approx. 1 1/8" diameter. Comes with chain.

This is the Form of Pentagram of Solomon, the figure whereof is to be made in Sol or Luna (Gold or Silver), and worn upon thy breast; having the Seal of the Spirit required upon the other side thereof. It is to preserve thee from danger, and also to command the Spirits by. - S.L. MacGregor Mathers and Aleister Crowley, Lesser Key of Solomon - Goetia

Talismans are active objects designed to give specific power, protection and encouragement to those that wear or own them.
Amulets are intended for general purposes and usually provide reactive protection from danger, illness and ill-fortune.
Lucky charms are intended to attract good luck and good fortune to whoever owns them.