Nothing happens. The gold used is incredably thin and has very little strength so the gold is broken into tiny fragments during chewing and digestion. If the gold is 18 to 24 carot then it will not break down in the body, rather looking like microscopic vertions of torn paper and balled up aluminium foil. If it is a lower quality some of the impurities may be leached out into the body but the majority will be excreeted the same as the 18 to 24, in the feces. None of the chemicals found in the GI tract can dissolve gold,and the gold is too thin and weak to cause any damage to the individual concerned. It is still not a good idea however to consume large quantities of gold metal as indigestable elements of foods in large quantities can cause issue to proper digestion.
Laboratory Technician, Ambulance Officer training.