Cholelithiasis is a condition characterised by the presence of gallstones in the gallbladder. Stones can be of two major types: Pigment stones: Pale yellow colour stones found in gallbladder exclusively Cholesterol stones: Black or brown colour stones found in biliary tree The picture shown above is of cholesterol gallstones. Picture credit: @medicase_original (via Instagram) https://www.instagram.com/p/CJ4UhXwh4NJ/?igshid=1mvxnwq4u7lk