How to Find Diamonds in Minecraft
Diamond blocks might just be the most coveted item in Minecraft, after dungeon rarities llike music discs and apples. But unlike items like music discs, you need diamond pickaxes to get any real work done, and is the only thing capable of harvesting obsidian. And if you want to take part in any large-scale construction projects, you'll need piles of diamonds.
There are a few techniques you can use to up your chances of hitting the motherlode.
Before you go hunting, you need to know where to look. You shouldn't even bother hunting for diamond above layer 16- that is, sixteen blocks up from the bedrock at the bottom of the map. The surface is usually around level 60.
Sometimes, you will find diamond blocks on their own, but usually they can be found in veins. If you find one block of diamond, there's a good chance other blocks are nearby.
Caverns, ravines, and abandoned mine shafts
Caverns, ravines and abandoned mine shafts are great place to look for diamond ore, as a lot of the work of clearing away cobblestone has been done for you. The large amount of exposed blocks can only work in your favor. You can also commonly find diamond blocks near underground lava lakes, as diamonds and lava tend to be located in the same layers. In fact, you may be tempted to believe that diamond is more likely to appear near lava, but this is not actually the case.
Finding a lot of diamond is going to take a lot of digging. You'll find yourself carrying hundreds of cobblestone blocks for each diamond block you come across. To make the most of it, you'll need an efficient mining pattern.
Don't bother digging out every single block; it's a waste of time and will unnecessarily wear down your pickaxe. Instead, dig out a long central tunnel, and dig out branching paths. You can skip two blocks between every branching path. This will expose as many blocks as possible without wasting your time and energy.