Why is the shield only offered as a necklace instead of a ring?
The shield has a flow. When you receive your shield you also receive directions for how to key it. The flow lines used in keying would be interrupted if it were a ring. Also, the pendant and its protective properties were made to cover your heart/chest area. Think of it like this, if you were using a shield would you want it to cover your torso area or one of your fingers?