Design Ideas Soap Stones, Assorted The cleansing power of nature is all around you. Sprinkle these purifying pebbles in your soap dish to experience a touch of nature and the freshness of the outdoors in your own home. All our soaps are mixed according to an honored Thai formula. Each piece will last for two or more washings. Dimensions are reflective of the box stones sold in; actual average stone size is .75 inches in diameter.