devtrackers.gg
It depends on how the method is written more than anything, to be honest; I was going by the assumption that one roll generates the entire bag's result. It's not super important, I was just including it for fun.
It's a while loop which generates a gem 40 times, each time it has a 1/100,000,000 to be an uncut onyx so the game can definitely theoretically give out 40 uncut onyxs