I searched for the site that explained what the different colors mean but couldn't find it. The following is from one of many site which mention the variety of colors (and shapws)stones can be:
For many persons, including children, the biliary ducts (tubing) are choked with gallstones. Some develop allergies or hives but some have no symptoms at all. When the gall bladder is scanned or X-rayed, nothing is seen. Typically, the worst stones are not in the gallbladder but in the liver. Not only that, most are too small and not calcified, a pre-requisite for visibility on X-ray. There are over half a dozen variety of gallstones, most of which have cholesterol crystals in them. They can be black, red, white, green or tan colored. The green ones get their color from being coated with bile. Notice in the picture (of Dr. Hulda Clark 's books) how many have imbedded unidentified objects. Are they fluke remains? Notice how many are shaped like corks with longitudinal grooves below the tops. We can visualize the blocked bile ducts from such shapes. Other stones are composites - made from smaller ones - showing that they regrouped in the bile duct some time after the last cleanse.