This listing is for one silver plated necklace with a 10mm natural pyrite bead that has been cut and polished very smooth into a cube shape with softly rounded edges. Pyrite increases the oxygen supply to the blood and strengthens the circulatory system. It is beneficial for the lungs, alleviating bronchitis and asthma. Pyrite is a highly protective stone, blocking or shielding you from negative energies from people, places and things.