Following revision by De Beers, the world’s largest rough diamond producer, of the mandate for the Supplier of Choice Ombudsman, who safeguards the objectivity of its distribution system, the Commission has decided to close its investigation. The Commission approved De Beers’ Supplier of Choice rough distribution system in 2003. However, a number of companies complained to the Commission that the SOC system would allow De Beers to gather sensitive commercial information from its customers which could ultimately lead to arbitrary supply decisions and indirectly aggravate non-clients’ access to raw materials. In light of the investigation of the complaints, the Commission requested De Beers to improve the transparency and the checks and balances of the SOC system. In response, De Beers significantly revised the Ombudsman’s mandate so that the Ombudsman will filter all information De Beers collects for the purpose of admitting customers and allocating rough diamonds. Following this and other improvements made by De Beers to the transparency of the system, the Commission reached the conclusion that the main competition concerns of the complaints have been addressed. It announced however, that it will continue to monitor the implementation of De Beers’ commitments and the SOC scheme. [31 January 2007]