Hello there, and you may be wondering how to find diamonds easily without struggle, or rage.
Your first step is to be prepared. Bring at least 7 iron pickaxes (or more) and some stone ones. I advise to bring torches as well if you are playing on easy +, and a shovel if you run into any dirt, or gravel.
Next you find a cave, a decent sized one, and find a place where you would like to diggy diggy hole.
Dig down a staircase (Do not dig strait down which you may fall into lava like I did!) to layer 12.6 (You can view
this by pressing F3 on your keyboard and looking at your Y coordinate.)
After you have reached level 12.6, dig strait in front of you. Be careful so that you won't walk straight into lava.
After dug a good distance, go back and make the ceiling at least 3 blocks high, or more if you want a higher rate of finding diamonds. Then widen out your area to about 10 blocks. Right now your mine should be something like 100x deep 10x wide 4x tall
If you have found diamond already, that is a great sign. Now at the beginning of the 100 blocks, make a strip mine. To make a strip mine, pick any side of your hollowed out area and dig straight in front of you (No, the area that you are standing on is not a side.)
Lastly, once you finish your first strip, make them allover the sides of the mineshaft, 5 blocks apart. And there you go. ^_^

If this has helped you, don't forget to leave a diamond, or a favorite!