You could easily make the shader I posted into a gem shader by changing the translucent part of the shader to a glass shader.

You don't have to be a shader guru. The more you play around with it, the better you will get at it.

Learning shaders like the Lightpath shader will allow you to do things that defy the common rules of PBR. And surpass anything a Monte Carlo based engine like Firefly, ever dreamed of pulling off.

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