Businessman Vashi Dominguez sold a vision of opulence and success to investors. They invested £170 million in his high-end jewellery stores and were told their cash was secured against a large stock of diamonds. But when the business went bust, there were hardly any diamonds in the safe. Now the cash and the conman have gone. Richard Bilton investigates a world where nothing was quite what it seemed, where staff pretended to be customers to make the shops look busy and sales figures were massively inflated
