Diamond

Diamonds are the second strongest item that you can make tools out of, the first being gold. Diamonds are usually located very deep underground, alongside being incredibly rare. When a diamond ore is mined, a diamond like the one shown to the right is dropped. Tools and Weapons can be made from diamonds, such as diamond axes, diamond pickaxes, diamond shovels, diamond swords, or diamond hoes.

History of Diamonds
Diamonds were added to the game files in 0.1.2 but they were not obtainable ingame until version 0.3.2. It is rumored that diamonds are rarer than the ones found in the PC and Xbox versions of Minecraft. This is possible because the world is not infinite. In the 0.6.0 update, diamond can be used to craft very strong armor against hostile mobs.