The diamond industry already has mounted a campaign to counter “Blood Diamond,” which opens this weekend, and now the U.S. government has stepped in. Hoping to stave off questions raised by the movie, state department officials held a briefing with reporters to assure them that international efforts have been successful at reducing the illicit trade to “siginifantly less than 1 percent,” according to deputy assistant secretary of state Paul Simons. The film, set in the brutal civil war in Sierra Leone in the late 1990s, shows how the trade in diamonds in conflict zones has helped pay for brutal wars in Africa. State department officials, worried that the pic will misinform the public, say that the movie takes place before an international initiative was started to control the trade, estimated as at much as 15% of diamonds sold at one point. Human rights groups still have concerns, and even U.S. officials gave the pic their endorsement. “We feel the film provides a good historical snapshot of the diamond industry,” Simons said. It may placate concerned citizens, but probably not DeBeers.