How exactly does it protect against emf? i tried it with an emf reader and there's no difference...

90% carbon releases radiation from the body and balances chakra

Is this more of a novelty item?

The book Shungite: PRotectin, Healing and Detoxification by Regina Martino explains EVERYTHING you need to know about WHY shungite works and HOW. It is the only mineral on earth that has the C60 molecule which is considered the Molecule of the 20th Century in science. The C60 is the perfect carbon molecule for healing and restoring harmony in the body and environment and it carries it's own naturally occuring electrical field. This molecule won the Nobel prize in the 90's and shungite has been used for it's "magical" healing powers and healing waters since the days of Peter the Great. Shungite is THE most healing stone on the planet when it comes to EMFs.

what is the range of protection and is there a guarantee if its doesn't work ?

The range of protection varies based on the amount of shungite and if it is paired with specific other crystals/minerals. Shungite by itself whether in the pocket or pendant is known to help protect a field of 1.6 feet. In the book Shungite: Protection, Healing and Detoxification by Regina Martino explains EVERYTHING you need to know about WHY shungite works and HOW. It is the only mineral on earth that has the C60 molecule which is considered the Molecule of the 20th Century in science. The C60 is the perfect carbon molecule for healing and restoring harmony in the body and environment and it carries it's own naturally occuring electrical field. This molecule won the Nobel prize in the 90's and shungite has been used for it's "magical" healing powers and healing waters since the days of Peter the Great. Shungite is THE most healing stone on the planet when it comes to EMFs.