The G♯ Diminished 7th chord is a four-note chord made up of G♯, B, D, and F. It is built from a root, minor third, diminished fifth, and diminished seventh.
Construction
| Note | Interval | Degree |
|---|---|---|
| G♯ | Root | 1 |
| B | Minor 3rd | ♭3 |
| D | Diminished 5th | ♭5 |
| F | Major 6th | 6 |
G♯ Diminished 7th Inversions



| Position | Notes |
|---|---|
| Root Position | G♯ – B – D – F |
| 1st Inversion | B – D – F – G♯ |
| 2nd Inversion | D – F – G♯ – B |
| 3rd Inversion | F – G♯ – B – D |
Key Signature
A Diminished 7th chord is built from symmetrical or ambiguous intervals, so it doesn’t belong to a single key and has no key signature of its own.
Same Notes, Other Names
The notes G♯ – B – D – F aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell the following: