Minecraft wiki entry for Diamonds, associated text: 1 Obtaining diamonds
1.1 By spelunking
1.2 By Ocean
1.3 By TNT
1.4 By branch mining
1.5 Villager trading
1.6 Video tutorials
2 Mining diamonds
3 Using the diamonds
3.1 Diamond tools
3.2 Diamond weapons and armor
3.3 Other diamond items
4 Maintaining and expanding the supply
4.1 Getting a Fortune III pickaxe
4.1.1 Obtaining books and bookshelves
4.1.2 High Level Enchanting
4.2 Repairing tools