A diamond is forever... and so was this render.  59 hours on a 1.8 GHz P4.
I used real world values and borrowed some from Marc Champagne, and then put
the settings up super high hoping for a nice picture.  The gem model is from
gemcad.

global_settings {
  assumed_gamma 1
  max_trace_level 100
  photons {
    count 100000
    autostop 0
    jitter 0  }}

  finish   { ambient    0.1
             diffuse    0.4
             specular   0.8
             roughness  0.003
             phong      1
             phong_size 300
             reflection { 0.2, 0.1  fresnel  metallic } } }
interior { ior 2.417  dispersion 1.044 dispersion_samples 30 }

I was wondering why some round brilliants have a bit of vertical spacing
between the crown and the cuts on the bottom and others don't.  Is this for
different stones of different refractive indices.  And what's with the
banding on the bottom of the stone?  Any comments or suggestions for
improvement would be appreciated.

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