At first sight, the surface structure of the stone was visually observed. In general, a uniform fine-grained stone has a delicate texture, and is a stone product; coarse-grained and unequal-grained stone has poor appearance. In addition, due to the influence of the earth's quality, stone often produces some fine cracks. The stone is most likely to break along these parts and should be removed. The lack of edges and corners is even more aesthetically pleasing, especially when choosing.
The two quantities, that is, the size of the stone, so as not to affect the splicing, or cause the spliced pattern, pattern, line deformation, affect the decorative effect.
Three listen, that is to hear the sound of stone knocking. In general, the sound of a good quality stone is crisp and sweet; on the contrary, if there is a slight crack inside the stone or the particles become loose due to weathering, the knocking sound is rough and dumb.
Four tests, that is, using a simple test method to check the quality of stone. Usually, a small amount of ink is dripped on the back of the stone. If the ink quickly spreads out and leaches out, it indicates that the internal particles of the stone are loose or there are gaps. The quality of the stone is not good. On the contrary, if the ink drops are not moving in place, then the stone material is good.