It is a pentatonic scale (audava-audava ragam[1][2] in Carnatic music classification – audava meaning 'of 5').
Its ascending and descending scale structure (ārohaṇa-avarohaṇa) is as follows: The notes used in this scale are shadjam, antara gandharam, shuddha madhyamam, panchamam and kakali nishadam (see swaras in Carnatic music for details on below notation and terms).
Gambhiranata rāgam lends itself for elaboration due to the pentatonic nature and symmetricity of the scale.
The mallari tune played in Nadhaswaram at temple processions are set to this musical scale.
Gambhiranata's notes when shifted using Graha bhedam, yields another pentatonic rāgam, Bhupalam.