How to find diamonds

First off, I will edit this later on.

Needed:
Iron Pick
Torches
Food
Patience
Knowledge of coords

First, push f3. This is your info or data. Look at X Y Z. These are your coords. (X is the one you need.)
Dig down until you reach 13. Make sure you dig a good 2 wide hole and not straight down... You know what would happen if so.
So, when you reach X-13 Which is "level" 13 This is the diamond level. Dig a long straight line by edge of plot then other "lines" connecting to it.
If you do every 2 spots, you cannot miss a ore on that "level" and most likely youll find a nice reward! (; Good luck!

I'm pretty sure diamonds are from bedrock to 16. Most common at 10-15. I've found some at below 5 myself