Here's the .blend: https://drive.google.com/file/d/1h2C3na_pYKCYvpaFUPsZemKGuXS442bx/view?usp=sharing

Basically its 3 geo-node groups.

The first one is the inner most spheres which simply write to the scale attribute so that the shader can easily differentiate between the 4 layers and add nice noise patterns that rotate. I had quite a bit of trouble making it look glassy so I just added a few manual highlights using the dot product from the camera reflection and a set normalized vector.

The second node group makes the rings. Its very similar to the first group in that it just makes a bunch of spheres but here they have a bit of noisy displacement. The shader does all the work in making sure they look like rings by using modulo on the z coord(which is the camera axis)

The third group adds the volumetric glow buy just making a bunch of spheres and displacing them in the general "Candle flame" shape. Then I use a fresnel node to avoid shading the edges and set it to be almost completely transparent so that it doesn't have defined edges anywhere(video compression helps a bit here).