If you can buy a diamond for five cents, it would be microscopic.
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You can't.
In order to have diamonds you have to apply lots of pressure onto carbon, not nickel.
In order to have diamonds you have to apply lots of pressure onto carbon, not nickel.
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you find someone with a diamond and trade them the equivalent value in nickel ore.
or use magic.
or use magic.
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You don't
It is not possible
It is not possible