after campela it heads to refiners in dubai and then out in the world.o one can say how much of the world market is fed by congo gold. the best estimates are around 1%. so it is not likely any particular watch or wedding ring contributed to rape or murder but we wondered how a consumer would know. the head of jewellers of america and the responsible jewelry council. >> reporter: does your certification mean the gold didn't come from congo? >> source of origin is not yet a part of the council's framework. >> how do you keep that gold out of american jewelry stores? >> one needs to know where the sources of controversy are if one is to try to prevent those sources from getting in to the legitimate supply string. >> it has been known a long time where the sources of controversy are in congo. >> the eastern province, yes, it has. >> jewellers know about the tragedy in con go, but it has never been standard industry the practice to trace gold to the source. jewellers buy gold from middlemen and don't ask where it comes from the. seven years ago the industry b