- Gmaj7
- Gdim
- Gmaj7
Gdim Guitar Chord
Everything about the G Diminished chord: How to play it, what it's built from, the chords it pairs with, and examples of pros using it in real performances.
NotesG • B♭ • D♭
Difficulty
Hard
Open-position diminished triad
What is the Gdim chord?
G Diminished is a three-note chord built from a G root, minor third (Bb), and diminished fifth (Db)—a dark, unsettling sound that sits somewhere between tension and mystery. It's tight, compressed intervals create an eerie, almost suspended quality that resolves naturally to nearby major or minor chords, making it a favorite in classical, jazz, and metal contexts where harmonic drama matters. You'll also hear it in film scores, progressive rock, and flamenco. The standard barre voicing at the 10th fret is demanding and requires solid finger strength, but once locked in, it delivers that signature diminished bite reliably.
Notes & Intervals
Gdim is spelled G (root) · A# (m3) · C# (d5). The diminished fifth—lowered a half-step from a perfect fifth—is what gives this chord its tense, unstable character; it's the sonic signature that makes Gdim sound unresolved and searching.
Where It Lives
Gdim appears most often as a passing chord or chromatic connector in jazz, classical, and film scores, rarely as a stable harmonic anchor. It's also the vii chord (F#m7b5) in the key of G major, where it naturally leads back to the tonic with urgency.
Gdim vs. Gm
Gm contains G · Bb · D (root, m3, P5), while Gdim replaces that perfect fifth with C# (d5). That single half-step drop transforms a sad, grounded minor chord into something darker and more dissonant—Gdim feels trapped or ominous where Gm feels melancholic.
Mood & Character
Gdim radiates tension, mystery, and unease—it's the chord of suspense and psychological discomfort. Reach for it when you need to signal danger, create a moment of harmonic instability, or set up a dramatic resolution back to a major or minor home chord.
Voicings for Gdim
Four ways to play it using the same three notes. Pick a voicing below to hear it on the fretboard.
- NotesG • B♭ • G • D♭DifficultyHard
Open-position diminished triad
Progressions that use Gdim
Hear how the chord works in context of songs.
Learn to play Gdim from the experts
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Frequently asked questions for Gdim
Gdim contains three notes: G (the root), Bb (a minor third above G), and Db (a diminished fifth above G). These intervals—1 · m3 · d5—give the chord its dark, unstable character. The diminished fifth is the key: it's one half-step lower than a perfect fifth, which is what makes the chord sound tense rather than stable.
The main voicing is an A-string-root diminished triad played at the 10th fret. Place your index finger on the B string (10th fret), your middle finger on the G string (11th fret), your ring finger on the D string (12th fret), and your pinky on the A string (11th fret). Mute the high E and low E strings. This shape is movable, so you can slide it up or down the neck to play other diminished chords.
Gdim is rated Hard (difficulty 4) because it's a chord that requires precise finger placement and pressure across multiple strings at higher frets. The 10th-fret position is far enough up the neck that hand stretch and finger strength matter. With practice, A-string-root diminished triad chords become easier, but they demand more control than open chords.
Diminished chords are typically used as passing chords or to create tension that resolves to another chord. Because Gdim is unstable, it often appears between two more stable chords—for example, moving from Gmaj7 to another chord. Diminished chords are common in jazz, classical music, and some blues and rock styles. They're less common in simple pop songs but add sophistication when used intentionally.
No. Gdim is a triad with intervals 1 · m3 · d5. A half-diminished chord (also called min7b5) adds a minor seventh, making it 1 · m3 · d5 · m7. For example, F#m7b5 is the vii chord in G major and contains the same three notes as Gdim plus an F natural. Half-diminished chords are more common in jazz and classical music than pure diminished triads.