Price listed is for two semi-precious stones. This is a mixed bag of black onyx ovals that all measure about 16mm by 12mm. Some measure about 1.8mm thick while others measure about 3.05mm thick. They all have flat backs. Some have flat tops, while others have more rounded tops. It's the luck of the draw! As with all natural stones, there may be some variation in size, shape, cut, and color.