Price listed is for each quarter-ounce of semi-precious stones. This is a mixed bag of flat back onyx stones that range in size from 6/4mm ovals and octagons up to 16/12mm ovals. The sample quarter ounce had 21 pieces in it. We cannot guarantee the number of pieces you will receive, only the weight. As with all natural stones, there may be some variation in size, shape, cut, and color.