This is from the Sigils of The Craft collection.  'An it harm none, do what you will, use spell-craft and magickal arts wisely to benefit themselves and others. Sigil charms, potent symbols of Witches' skills, energise and empower the magickal intentions of their wearer. Produced in sterling silver, each Sigil of the Craft charm comes with a black cord necklace, and is presented in a pentacle jewellery box.