Is it possible to create a material that simulates looking through a gem?

I was going to create a mesh that would be like a gem (such as a diamond).

I wanted that this material to be transparent, which is quite easy, but I also wanted it to:

  • Occlude everything inside this mesh
  • Show what’s behind the mesh in a distorted way. Maybe showing what’s behind in an inverted way or heavlity twisted.
    Any idea?
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