Diamonds are actually quite common... there are even whole planets made of diamonds, the only reason they have value is because De Beers has the diamond cartel and controls the price as well as demand.

Debeers even created the first idea that people needed diamond rings for weddings...

Debeers is just another centralized faggot.

edit:
http://www.youtube.com/watch?v=N5kWu1ifBGU