Sculpted of amethyst in this case, a worry stone is part of a tradition originating in Ancient Greece. With an oval shape and a thumb-sized indentation, it is intended to be cupped to the palm and rubbed with the thumb when your worries have got you down. Rub the stone to help make your worries fade away. This stone measures approximately 1 1/2" x 1 1/4", with minor variations in size and shape.