Feasibility of organisms with translucent upper craniums

After reading this post about a sort of translucent biological visor I was inspired to incorporate a similar design. I'd like to create an organism with a translucent upper cranium, serving no purpose beyond aesthetic value. It would likely have resulted from sexual selection, directly displaying the brain underneath.

Is there any biologically occurring material which the translucent section could be made of? Ideally it would have a similar compressive strength to that of bone.

Here is an example of how it might look, the humanoid skull in place of a brain:

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Feasibility of organisms with translucent upper craniums

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