Exploding Rich from One Cut

Shen Qianshu's rock was too big. It was the last to be opened. Although the water stone was big, it looked exceptionally round on the surface with no diamond-shaped surfaces. It was like most water stones, but the surface was not smoky-black, sandy, or yellow. It was ordinarily black and detailed.

The craftsman in charge of cutting it open was under great pressure.

In the hall, Shen Qianshu was the appraiser who received the most attention.

Everyone was trying to compare her to Lu Mengxi. She picked a very obvious rock that looked like it would be filled with impurities. The craftsman was afraid that all of them could have seen wrong. Is there anything special about this rock?