Worry stones are used to be put in your pocket. They are oval shaped and have a thump size indentation. Most common uses are for relaxation and stress relief by moving your finger back and forth on the stone. 
Black Tourmaline cleanses, purifies and transforms dense energy into lighter vibration. It protects against electromagnetic smog and negative energy of all kinds. It grounds energy and increases physical vitality, dispering tension and stress. It encourages a positive attitude no matter what cirrcumstances and stimulates altruism and practical creativity.