Bismuth is the strongest diamagnetic material, with lead as one of the
weaker diamagnetics.
Jerry Gallimore used bismuth in his (1975) room-temperature superconductor,
to eject the magnetic field and channel the interfering energy, possibly
gravity.

He found that there is a halo-shaped field of gravity around the midpoint
of a bar magnet.

Bob Fryer

>Diamagnetism has been used for years as a method to achieve very fine
>adjustments in the inductance of coils.  In RF work, a coil is wound with a
>diameter of perhaps 1/4" and a length of maybe 1".  Instead of using the
>typical ferrite core, a brass (diamagnetic) core is used.  When adjusted in
>and out of the coil, the brass affects the inductance of the coil, but only
>very slightly and in the opposite sense than that of ferrite.  Inserting
>the core reduces the inductance.
>
>Charts can be found of the permeability of diamagnetic materials, which is
>less than one.  Can't remember where I've seen them, and I don't remember
>frogs being listed.
>
>Karl Cunningham

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