Gems are as nice theme, but the wheel on gems is already round.
If you go to youtube and type in rendering a diamond
you get things like this:
https://www.youtube.com/watch?v=IuhHam3_uwY

I think this is how it should look. Ok, Octane is a commercial program, but if
we stay with Freeware, this one looks good:
https://www.youtube.com/watch?v=ebsXFEVwlWM

The only Gem, nobody can render at this time is the OPAL.
Diamonds, Ruby's etc. is just some sort of more or less coloured glas,
with another IOR and maybe a bit Dispersion ...

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