These three diagrams illustrate the root position (1 b3 b5), first inversion (b3 b5 1), and second inversion (b5 1 b3) of the F# dim chord
Here is a keyboard part which makes use of the chords Bm and F#dim.
Like any piece of music, the previous example can be transposed to other keys. Here is the same part in the key of C.