G#dim Chord on Guitar
G#dim = G# – B – D (Root, Minor 3rd, Tritone)
G#dim follows the same construction as F#dim and Gdim lower on the neck — one string, the A string, has to be muted entirely rather than fretted, since a plain diminished triad's three notes don't distribute evenly across six strings without doubling awkwardly or silencing one.
The sounding notes are G#-B-D: root, minor third, and diminished fifth, a stack of two minor thirds producing the most inherently unstable triad in standard harmony. Diminished triads function almost exclusively as passing or leading chords, and G#dim's most natural role is as the viio of A major, driving hard toward that tonic from the seventh scale degree. It also shows up as a chromatic passing chord connecting two diatonic chords a whole step apart.
Fingerings
Barre (4th fret)
How to Practice It
Spend real time on the muting technique rather than the fretting itself, letting the thumb or a spare finger lightly damp the A string so it doesn't ring during a strum. Practice resolving G#dim to A major to hear the leading-tone pull that defines the chord's purpose.
Common Progressions
- G#dim – A (viio – I in A major, the classic leading-tone resolution)
- F#m – G#dim – A (vi – viio – I in A major, a stepwise ascent)
- A – G#dim – F#m (I sliding chromatically down through a passing diminished chord to vi)
- D – G#dim – A (IV – viio – I, another common leading-tone cadence)
FAQ
- Why does G#dim need a muted string?
- A diminished triad only has three distinct notes, and this shape's most natural fingering leaves the A string sitting on a pitch outside the chord, so it has to be silenced rather than fretted or left open.
- What does G#dim resolve to?
- Most commonly A major, since G#dim functions as the viio (leading-tone diminished triad) of A major, resolving up a half step to that tonic.
- Is G#dim ever used as a destination chord?
- Rarely — diminished triads, built from two stacked minor thirds with no stable consonant frame, are almost always used to create tension that resolves elsewhere.
- How does G#dim differ from G#dim7?
- G#dim7 adds a fourth note, the diminished seventh, stacking one more minor third on top and making the whole chord symmetrical, whereas G#dim is just the three-note triad.
- Is G#dim physically difficult to play at the fourth fret?
- Not especially — it's a compact shape without an unusual stretch, and the main challenge is keeping the A string cleanly muted rather than any demanding barre technique.
G#dim on other instruments: G#dim on Piano, G#dim on Ukulele. Related: how chords are built, chord finder.