You will need an Iron Pickaxe (or better).
If you mine it with a wood/stone pickaxe it will break and give you nothing.
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You need either an iron or diamond picaxe to mine gold ore
Nope, you have to mine for diamonds with an iron pickaxe.
To mine diamonds in Minecraft, you have to use an diamond or iron pick. Click and hold with your mouse on the diamond ore until it breaks. A block of diamond should come out of it and into your inventory. Then you have to cook it in your furnace to get diamonds.
In classic Minecraft (versions prior to Beta 1.3), diamonds were not available. Diamonds were introduced in Beta 1.3, which was released in August 2011. Prior to that update, players did not have access to diamonds, and the game's resources were more limited. If you are playing a version of Minecraft that is Beta 1.3 or later, you can find diamonds deep underground and mine them with an iron or diamond pickaxe.
(Example) You have a silk touch iron pick and your in a cave. You find diamonds and mine them, but instead of diamonds, you get diamond ore!