Cutting stones follows an unwritten rule: always start with the cheaper ones and save the expensive ones for last.
Cheap stones rarely yield anything valuable, which keeps the hope alive for later.
The cheap stones Jiang Han chose were just to make up the numbers, so the stones they cut at the beginning yielded nothing.
Soon, Jiang Han's side had cut thirty stones, producing only a single Cloud Water Stone worth just over ten thousand Mystic Crystals. This was a stroke of luck from Jiang Lang's random choice.