It looks simple enough to model i'd just intersect two solids. I found it here:
https://sketchfab.com/3d-models/bond-2015-007-spectre-ring-5585bff1b7d3496f997d6c6aae5d2d57
Hi Majid The smoke is a png smoke texture with transparency added to a face me billboard. I tweaked the transparency more by making it a single sided sub surface scattering material.
Typical render from you which means high in atmosphere and emotional content. I had to look at this several times to take it all in and that is the best thing about your renders, making me think about the content and context of the product. Stunningly well done, Simon, Brahma mate