Tor Olav Kristensen wrote:
> 

> >
> > I does not look like it is an ideal cut. It seems like there is a "hole"
> > in the culet of the diamond. This hole should not be there.
> 
> My understanding is that the small facet at the
> bottom of the diamond is called the culet.

Yes, you're right. I didn't study the drawings and descriptions closely
enough.

> I now think that I made the culet a little too big.

I does look like it is a little bigger than it is supposed to be, yes.
Also, a brilliant cut diamond is supposed to have 58 facets, and not 74
facets as in your diamond?

> Thank you for rendering it with photons.

Your welcome, I've traced a new version with radiosity and a little
different settings.

> Now I'm sure that I like Photons very much !
> I especially like the "fire" that appears
> within the diamonds in your rendering.

The fire is caused by a dispersion setting of 0.75 in the interior
statement.

> I'm curious about how the code looks now.
> Could you please post the code with your
> modifications for Photons ?

But of course.

> Maybe it would then be wise to lower the
> reflection value for the blue "ground"
> plane so that the reflected diamond image
> does not destroy the caustics.

There are some caustics visible with the current settings. Have a look
at the attached image. 

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