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black gallstone, dark gray to black, metallic luster, opaque the stone is rich in rare minerals and naturally contains magnets. it is helpful to the human digestive system and nerves. system and blood circulation system, have remarkable curative effect. it is said that wearing it for a long time can help prevent health problems and prolong life. black gallstone has the reputation of "healthy treasure". it is also called "the king of black gall". black gallstone deposits