Diamagnetism question

Monney

Theoretical problem:
You have a piece of Pyrolytic Carbon, let's say 50mm x 50mm x 3mm thick.
You want to levitate it along with a 25g weight on top.
Levitation height does not matter.

Would it be possible to find the Magnetic Flux density needed to do this?

I think it will involve Curie's law or maybe F=(m∇)B but I am not sure how to do it