Here are the details on the small device I created to achieve levitation of a small magnet using pyrolytic carbon.
The explanation is located here on supermagnete with the links to the magnets
I bought the pyrolytic carbon from both a UK site mindsetonline (if you get a session expired message go to homepage then click again on the link) and a US site scitoyscatalog .
Here is a video of the levitating magnet diamagnetism