Diamonds are a vanilla item in Minecraft, they are one of the rarest materials. 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.
For more information on Diamonds, please visit the Minecraft Wiki site HERE
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