Gdim chord
G diminished
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>G
F#
G1
G#
A
A#
B
C
C#
D
D#
E
F
F#
G
G
C
C
C#b5
D
D#
E
F
F#
G
G#
A
A#
B
C
C#
E
D#
E
F
F#
G1
G#
A
A#
B
C
C#
D
D#
E
G
A
G#
A
A#b3
B
C
C#
D
D#
E
F
F#
G
G#
A
A#
3
5
7
10
The Gdim chord has the formula 1, b3, b5 with notes G, A#, C#
The diminished chord is a variation of the minor chord with a flat 5th note. It is less common in popular music due to its high tension, but can sometimes be used as a bridge between two chords to emphasize the release of tension.