Diamond

Diamonds are one of the rarest and most recognizable materials in Minecraft.

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.

Smelting
You can smelt diamond but to save these ingredients: wood,charcoal,coal you can use an iron,diamond,gold pickaxe to mine the ore.You cannot use a stone or wooden pickaxe because those are incapable of mining blocks of ore or blocks of diamond,emerald,gold,iron,red stone and so on.

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.

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