Gold - part three

As the paper-money financial world is revealed to be fictional, people have been rushing to invest, once again, in "real" gold.

Nick Rankin unlocks the history and enduring fascination of the rare yellow metal that has been integral to economic exchange systems for millennia.

From King Midas to gold-rushes, from bling to Wall Street, this three-part series takes in the global realities and rich symbolism of the coveted mineral that shines on us all.

Programme three:

In part three, Nick Rankin explores how we assess the value of gold.

From Olympic winners' medals to "bling", gold is everywhere. There is a dollar's worth of gold in every mobile phone.

With the price of the metal going up in recent years, the documentary examines why more and more people have got gold on their minds.

Also under consideration is the cost of gold - to the people who battle to get it, and to the planet.