While the worry stone is a natural method of relaxing and reducing stress, it actually has a ancient Greek origin. Worry stones are smooth, oval-shaped, polished and beautiful. Worry stones at eCanyons come in several different variations. They range from a traditional stone worry stone to a colorful cats eye gemstone, and are also offered in onyx, bone, amethyst, opal, rose quartz and crystal or quartz. Worry stones are believed to be a source of stress relief and reduce one's worries when rubbed.