In this case, it’s hand painted in 2D. You could possibly use a smoke simulation (volumetrics) and some strong lighting to get a similar effect, but I think you’ll get closest results using smoke simulation to get the forms and then paint over the colors
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Hi there,
It is not a direct answer, but can get you a similar effect using volume. Check this ducky3D tutorial. Imagine a coin or UV sphere slapped really thin 
You can actually do this with normal shader nodes but rendering volume can be cool as well, it can give this stylized crystal kinda look 
PS: for the side you use Layer weight for example, you can make it an emmission base, to get that glowy edge, or tweak a position vector with a colour ramp?
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Thank you a lot! This is amazing.
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