A big row has sprung up about diamonds after a Hollywood movie sparked debate over where they come from.
Blood Diamond highlights the illegal trade in the precious stones, and stars like Leonardo Di Caprio are speaking out about the problem.
Diamonds mined in countries where wars are raging are called conflict, or blood diamonds, and charities want more controls to stop them being sold.
The diamond industry says there are very few conflict diamonds around.
It also says legal diamond mining is good for the countries they come from, and they have started paying money to charities in Africa to try to help problems like poverty.
Actor Leonardo Di Caprio has spoken about the issue
The charity Amnesty International has claimed four million people have died in wars which have been fuelled by the trade in blood diamonds.
There are already special rules to stop them being sold, but charities say they're not strong enough, and that some illegal stones are slipping through the net.