Edited

The common bright-green small stones one gets after the first flushes come from the liver bile ducts and are made of bile and fats, while gallbladder stones usually start coming out after having done 5 to 8 flushes. They are differently-colored and sink in the toilet water because they're calcified or semi-calcified; expelled hard stones from the gallbladder can be quite large. There are pictures of some measuring more than 1'', even up to 2'' . So it should take about six months to get to see them. Since they sink it may not be easy to spot them but according to testimonies when these hardened stones get out the effect on health is the most dramatic with lifelong gallbladder-related conditions such as shoulder pain and scoliosis suddenly gone for good.