What is the betting stone writing?

Betting on stones or goods means that when jade is mined, it is wrapped in a weathered leather bag, and it is impossible to know whether it is good or bad. The quality of jade can only be known after cutting.

Gambling stone means that the protagonists usually have gold fingers, and they can see or detect whether there is jadeite and its texture in the original stone, which is called' no instrument in the world can see through it so far'. Then the text is probably full of stories in which the protagonist gambles with others and then wins with great strength.