Williamson Diamonds Limited Corporate Headquarters   Address Mwadui, Shinyanga Province Tanzania P O Box 9470 Dar Es Salaam Tanzania   Administration Tel: 0255 28 2763872 Fax: 0255 28 2762965 Email: wdl@wdl.co.tz   Production Tel: 0255 28 2763849 Fax: 0255 28 2763849 Email: production@wdl.co.tz