How do you get gems like diamonds etc to look shiney and well, like they are supposed to inside of Poser?

I have raytracing turned to 4 and when it renders it renders horridly. Dull, no shine and looks nothing like a diamond is supposed to look like.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi