Pics shows: Bo Chunlou and his pig treasure; A villager who found a pig’s gallstone is set to become a Chinese millionaire after experts valued it at nearly half a million pounds. The extremely rare object known as a "bezoar" is a mass comprised of hairs and other indigestible materials usually found in an animal’s gastrointestinal system. Practitioners of traditional Chinese medicine call them "Pig Treasure" and believe products made from the bezoar can remove toxins from the body, making it a rare and valuable substance to have. Villager Bo Chunlou, 51, found the 4-inch long, 2.7-inch wide bezoar this August when he slaughtered an eight-year-old sow on his farm in Ju County in Rizhao City in China’s eastern Shandong Province. The pig weighing 250 kilogrammes (550 lbs) had the large gallstone inside her body, which the villager's neighbours then told him was of great medicinal value. At first dubious, Bo and his son Bo Mingxue, 26, eventually travelled to the major port city of Shanghai, where they spent over 40,000 RMB (4,495 GBP) getting appraisal from experts. The pair were told the market price for pig bezoars of this size is up to 4 million RMB (448,330 GBP) - a sum that would change the village family’s fortunes forever According to experts, the stones only have value if found in the animal’s gallbladder. Bezoars found in the stomach are worth nothing. Bo, who now even has an appraisal certificate to show for his special 'Pig Treasure', says he would accept offers starting at 1 million RMB (112,120 GBP).