Stone and coal=Wood/Gold or better
Iron=Stone or better
Redstone, Lapis Lazuli, Gold, Diamond, Emerald=Iron or better
Obsidian=Diamond only
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In Minecraft, you will need to use an iron pickax to mine the rubies in the game.
you can use a iron pickaxe to mine it as this can mine every ore in minecraft
iron pickaxe
You can use an iron, gold, or pre-existing diamond pickaxe to mine diamond ore or diamond blocks
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.