The G Diminished Arpeggio contains the following notes:
G – Bb – Db
It is essentially an G minor chord, with a flat 5.
Here’s how to play the G diminished arpeggio in the open position.
G Diminished Arpeggio CAGED Positions
Here are the 5 CAGED positions for the G diminished arpeggio on the guitar (notes and tabs).