I have noticed that the amount of bells I get at the rock quarry doesn't seem to have anything to do with what gems I dig. I have dug almost all gold and silver gems and recieved a low amount of bells and then dug all ruby, etc. and gotten a very high bell count. Is this totally random?
I think it has times when it pays better. And gives less bells if it's also giving items. I know there are times it's like sparkly and I think that's when it gives more. I could be wrong because I've just been waiting for specific things to show in my quarry.