How do I render Diamonds

[myteax]

I am having difficulties rendering a diamond on a ring. It comes out looking not photo realistic. How do I achieve this - find attached.

[Micha]

Did you enable dispersion at the material? You could play with the abbe parameter to get stronger color effects. (You need to enable the advanced UI at the material and you find it at the refraction options.)

Your rendering looks already quite nice.