This is Sigmund's diamond, but slightly modified.

I changed the pigment a little (pigment {color rgbt <.90,.90,1,.8> }),
including changing the filter to transmit.  I removed radiosity so that it
doesn't take forever to render and I changed the plane texture.

This is the result.  I like the prism effects that are clearly visible, but
unfortunately, the caustics almost totally disappeared.  I did not change
the number of photons from the original source file.
I find it looks more plastic, but it's still kind of nice.

It took 1h 14m to shoot the photons and 13h 26m to render.

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