Examine the density of the stone: Greenstone is limestone, material.The density is decent. Take a look at the side of the stone, which is what we refer to as the stone's vertical grain. The visibility of the sedimentary layers is quite clear. The smaller the sedimentary water lines, the higher the stone's density.The quality of Qing Shi is exceptional.

- Assessing stone's water absorption rate: The absorption rate of green stone is not easily analyzed visually. You can pour water over the cut surface of the green stone and observe the water's spread on the stone's surface. If the water spreads slowly, it indicates a low water absorption rate and good quality of the stone.

- Assessing Stone Color Variations: Observe the surface color consistency of the green stone, checking for any significant color discrepancies. Look for distinct yellow spots and patterns. If there are no significant color variations, it indicates high-quality stone.

Inspect the flat geometric dimensions of the stone: Measure the processed green stone surface with a ruler, focusing on the diagonal measurements of the stone to observe the flat dimensions and relative line data. If the stone dimensions are uniform and flat, it indicates good stone quality.

Inspect the completeness of the stone: Strike the side of the stone with a hammer and listen to the sound. If it is crisp, with a clear echo, pleasant to the ear, and without any noise, it indicates that our stone has high hardness and good quality.

Additionally, when purchasing green stone slabs, it's important to note the packaging and thickness of the stone, ensuring it's well-protected for easy transportation, as well as the pricing of our stone.