Pietra dura
Pietra dura is also different from mosaics because stones are mostly much larger and cut to a shape suiting their place in the image, not all of roughly equal size and shape as in mosaic. In pietra dura, the stones are not cemented together with grout, and works in pietra dura are often portable. Nor should it be confused with micromosaics, a form of mosaic using very small tesserae of the same size to create images for Byzantine icons, and later for furniture panels.