1. that the naked eye observing the surface of stone structures. In General, uniform fine structure with delicate texture of stone, stone for all; ranging from coarse grains and grain structure of stone look less effective. In addition, stone often owing to geological processes in which a minor crack, stone most easily along the fracture, attention should be removed. As for the edges are affected by shortage, particular attention should be given when choosing.
2. the stone size specifications, so as not to affect splicing, or cause a mosaic pattern, pattern, deformation of a line, affecting the decorative effect.
3. listening to stone's striking voice. In General, good quality stone tapping its clear and melodious; on the contrary, if slightly within the stone cracks or due to weathering resulting in loose contact between particles, tapping the gruff.
4. simple test methods for testing quality of stone. Usually on the back of the stone drops a small ink, ink will soon disperse Leach, indicates that loose stone particles or cracks, poor quality stone and vice versa if the ink droplet still, then the stone of good quality.