Attached Link: Fresnel Effect in Poser

Poser does support Fresnel - there is even a fresnel node! If you are doing clear glass, diamond, water, anything that doesn't color the refractions, you should be using the fresnel node.

If you're doing colored glass, ruby, wine, cranberry juice, anything that does color the refractions, then you should use separate reflect and refract nodes. The refract should be colored. The reflect should NOT. Please follow the link to my discussion of the importance of the fresnel effect and how to do it for many different types of materials correctly in poser.

Also, as I said earlier, gems are cut to take advantage of total internal reflection. Under most viewing conditions and angles, you cannot see through the bottom of the gem. I suggest that if you place the gem in a ring or other jewelry setting, you will not actually directly view the bottom facets. So you should create two material zones (use the grouping tool) and put a different material on the bottom facets. They should be just perfect reflectors, like a mirror.

Operaguy, I think a lot of sparkle is due to direct reflections of the lights in your scene. This is the job of specular nodes. I like the glossy one. If you put a glossy node into your shader, it will help - as you rotate the gem, it will pick out individual facets that face the right way to catch the light and they become really bright white, while nearby facets will continue to show the reflect-refract because they miss the light.

Also, your sphere-map is connected to a solid color. Instead you should connect it to an image map with some high-contrast  shapes or blobs. Or even better, surround your gem with a real environment sphere, including sky, clouds etc. or for indoor actually assemble a room around it.

 

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