Worry Stone has a smooth touch and appearance, and are usually in an oval shape and have a thumb-sized indentation. They usually fit in the curl of the index finger and the thumb rests easily and naturally in the indentation. 

 Since the beginning of time, man has had high stress levels and a lot of worry time. Worry Stones are mans pocket tranquilizers. Rubbing the smooth surface of the stones puts pressure on nerves within the thumb and may produce endorphins, the brains natural relaxants.