These "pocket tranquilizers" use a form of reflexology, or nerve pressure. Rubbing the smooth surface of the stone puts pressure on nerves within the thumb that may release endorphins, the brain's natural relaxants. Worry stones may vary in sizes.
AMETHYST is the purple variety of quartz crystal composed of silicon dioxide with traces of iron. Helpful in ridding nightmares. Just hold the Amethyst crystal on the forehead for a minute and ask it to guide you through a peaceful sleep, then place it under your pillow. Also helpful to calm an overworked and overstressed mind.
Approx. 39~40mm long, 39~40mm wide, 5~6mm thick