Horizon: How the production of high-quality, coloured and clear synthetic diamonds in Russia and America could pose a challenge to De Beers, the world's largest trader of the gems, and flood the market with mass-produced stones. At a vast cost, the multinational company has set up a new scientific division, assigned the task of finding a way to tell the difference between man-made diamonds and the real thing - but is it detectable?

Starring:

Bernard Hill, Jack Fortune

Genre:

Documentary