1. Observing the Surface Structure of Stones with the Naked Eye

Generally speaking, the best stone has a delicate texture, and the appearance quality of coarse-grained and unequal-grained stone is poor.

2. Measure the size and specification of stone

The stone with better quality has smaller dimension error, less warpage and smooth surface.

3. Listen to the knock of stone

The sound of dense and solid stone is clear and pleasant, and if there are cracks in the interior, the sound is hoarse.

4. Inspection quality with ink

A drop of ink on the back of the stone, if it is quickly dispersed and leached everywhere, indicates that the quality of the stone is not good, and vice versa.