At one time Belgium was the premier cutting and polishing centre in the world, but that has changed. Belgium very polishes very few diamonds now, but it is still the major trading centre for diamonds in the world. Something between 75 and 90 per cent of all rough diamonds as well as a significant portion of polished diamonds are traded through Antwerp. The biggest cutting and polishing centre today is India. Although India is no longer mining diamonds, diamonds are India's - polished diamonds are their biggest export.