Listen to the warm tones of G3. Is this the deep low tone you would like to meditate to? If so, you might consider adding C4 for grounding tones (Perfect 4th), D4 for total relaxation (Perfect 5th) or E4 for expanding tones (Major 6th).
Not sure what note is the lowest in the third octave?
This is the order of the crystal singing bowls, lowest to highest in the third octave.C3, C#3, D3, D#3, E3, F3, F#3, G3, G#3, A3, A#3, B3