The diamond industry must act to eliminate the international trade in conflict diamonds. That's the message from ActionAid, Amnesty International and Global Witness as the World Diamond Congress (WDC) meets in London on 27-29 October. "20% of the diamonds sold worldwide are illicitly traded. Some of these diamonds are used to buy weapons for rebel groups in Africa, as well as financing conflicts. And yet diamond traders have failed to act," said Alex Yearsley of Global Witness.