Sometimes all you need is a small reminder to stop the worry and just breathe. Therapists practice a technique for those who struggle with anxiety, worry, obsessive thoughts, etc. They advise their patients to tell themselves to "STOP". Let this stone serve as that gentle reminder to STOP and BREATHE. Breaking the cycle of these thoughts can be just what is needed to right one's mindset.
Stones vary in size, color and shape, but all are approximately 2" size.