interval
G♯ perfect fifth
G♯lowerD♯upperP57 half steps
Seven half steps. Stack twelve of them and you land back where you started, give or take a comma.
On the keyboard
What is true of it
G♯ up a perfect fifth is D♯: 7 half steps, and 5 letters counting both ends.
Turn it upside down — put the G♯ on top — and it becomes a perfect fourth. The two numbers always add to nine, and the two sizes to twelve.
It is a perfect consonance.
Every interval on G♯
G♯ → Aminor second · dissonanceG♯ → A♯major second · dissonanceG♯ → Bminor third · imperfect consonanceG♯ → B♯major third · imperfect consonanceG♯ → C♯perfect fourth · perfect consonanceG♯ → C𝄪augmented fourth · dissonanceG♯ → Ddiminished fifth · dissonanceG♯ → Eminor sixth · imperfect consonanceG♯ → E♯major sixth · imperfect consonanceG♯ → F♯minor seventh · dissonanceG♯ → F𝄪major seventh · dissonance