Allegations have surfaced of gold being traded in the world's biggest marketplace, Dubai, in breach of international guidelines restricting the trade of gold from conflict zones.

A former partner from the global accountancy firm Ernst and Young has told Al Jazeera he found gold worth billions of dollars was being traded in cash, and also that gold had been painted silver to get past customs regulations.

Al Jazeera's Laurence Lee reports from London.

Source: Al Jazeera