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You don't. You must mine all the way down to 16 feet or less where diamond ore will generate. You must then mine it with an iron or diamond pickaxe
go on minecraftwiki.net and there is a whole page on it and it also helps you translate the code.
The strongest material in the survival mode of Minecraft seems to be obsidian. It cannot be blown up by TNT or creepers, and can only be harvested by a diamond pickaxe. Another opinion is that bedrock should be considered the strongest material as it cannot be mined at all in survival mode.
Diamond Armor, Diamond Tools, other stuff like Jukeboxes. The rarest material of all.. diamonds. You find some, you should be happy Diamond is the highest tier in UNMODDED minecraft. See DIAMOND.
Actually you don't need more than 20. Minecraft enchanting is all luck, you can actually get every natural enchantment on a pickaxe with level 25.