[caryjames]

Hi All- I would like to be able to render some coloured diamonds in my jewellery designs.

Is there a way to easily alter the colour of the diamond ior file without getting into loading spreadsheets of physical and gemmological properties?

Thanks

[Mihai]

There is no easy way to change the ior file itself, but you could perhaps blend the ior with a dielectric bsdf, search on the net for ND and abbe data for the stones you are trying to render.

[caryjames]

Hi Mihai- I know that the refractive index for diamond is 2.417 and the dispersion is 0.044. I do not know if the abbe number is the same as the dispersion value that I have for diamond.

Do you have a quick thought for how to blend a dielectric bsdf with the ior so that the ior values are dominant.

Thanks Mihai!

[caryjames]

I don't know if anyone has any use for this but after a bit of research I found a wizard that can help calculate the abbe number. Interesting stuff albeit a bit dry .

http://abbenumber.info/index.php?group= ... material=C

I am going to have at creating a coloured diamond using the index of refraction and the abbe and see what it looks like.