Diamond sellers in the United States and Britain are not doing enough to ensure that proceeds from the gems they sell are not financing wars and that buyers understand what are "conflict diamonds," says a new report. Nearly two years after the global diamond industry committed itself to prevent the trade in diamonds from areas where they have fuelled civil war and violence, most of the retailers contacted by activists were unable to provide a clear account of the origins of their jewels, according to the survey released by Amnesty International (AI) and Global Witness on Monday.