Before soon, using natural stone as the constructive material is very luxurious, however as a result of stone material mining and process technology's development, the natural stone material has already obtained the wide range to be popular. The same with the clothing profession, the stone material will also have the popular fashionable tidal current. Some time ago, the demand of red and yellow stone was very big, quickly, using black stone material became the tidal current which the people pursued.

Black stone material give us lofty, high grade impression, after mirror surface precision work give human solemn, magnificent and expensive feeling. But not all black stone material may use at will. Even many laymen still called all degree of hardness high stone material as granite, degree of hardness low is called the marble.