Can you give me some ideas for writing my own poem for the topic 'blood diamonds' ?

You can make a metaphor about how money or jewels cause war and blood

You can start by talking in rhythm about a Diamond and how you would trade the world for it, 

Than when you get into the middle you can say how much pain & money it brings you when you have it,

At the end you can say all of the stories people have told about this "Blood Diamond" and how great it was but it's not

I really hope this is helping you