there is an update available that - among other things - includes 
spectral data for a few minerals.

The first image shows (left to right) Sapphire, Emerald and Ruby. The 
used gem cut courtesy by Richard Conley.
The second image is the usual brilliant cut with "fancy yellow" diamond 
spectral data.

Example scenes to generate both images are part of the spectral render 
package at
http://www.lilysoft.org/CGI/SR/Spectral%20Render.htm

have fun

-Ive

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