Facet, that's a wonderful edit, thank you! What a fitting thing for you to help with.

I'm not all that familiar with shading transparent, shiny objects like gems, and I struggled to find a good reference for this so I ended up just winging it. I'll definite take into account your edit.
I should've included my references: this was a request and the guy who wanted it included
this and
this as references. I ended up sort of mixing the two and going for more of a faceted gemstone feel.
The anatomy isn't accurate, I may end up trying to combine the head and thorax when I work on this. Maybe I'll do a more realistic-feeling one and a more fantasy-shiny one, like you suggested, Grimsane.