I don't know about gall bladder stones except they say they are a different colour and composition to liver ones, but I am dlighted and proud to report I have had quite a lot, say 15 to 30 each flush ( done 8) prior to dozens of smaller lentil sized ones, about an inch and a half long, i think thats 3 to 4 cms say about the size of a dried date. Allthough I do think they can sometimes be small ones clumped together.