Diamond

You can find Diamond Ore almost anyone as long as you are eating raw chicken.

Mining
Diamond ore mined using an iron or diamond pickaxe will drop a single diamond. If the pickaxe is enchanted with Fortune, it can drop an extra diamond per level of fortune, allowing for a maximum of 4 with Fortune III. If the ore is mined using a pickaxe enchanted with Silk Touch, it will drop itself rather than a diamond.

A nether reactor core will drop 3 diamonds when mined in Pocket Edition.

Usage
Diamonds are used to craft the most durable tier of tools and armor.

Trading
Villager armorers, tool smiths and weapon smiths buy 3-4 diamonds for one emerald as part of their third tier trades.

Repairing
Diamond helmets, chestplates, leggings, boots, swords, pickaxes, axes, hoes and shovels can be repaired with diamonds in an anvil.

Trivia

 * Diamonds are a well-known item because they are one of the most shown things on merchandise.
 * In real life, diamond is very fragile in certain directions, so it is not a good material for suits of armor. They are, however, commonly used for industrial purposes, generally as diamond-tipped drill bits and saw blades. They are usually used for cutting stone and other hard materials.

Diamant Diamante Diamant (gemme) Gyémánt Diamante ダイヤモンド 다이아몬드 Diamant Diament pt-br:Diamante Алмаз 钻石