I want to share this list , I think that helps a lot when tried to found right reflections/refractions on Vray materials.
A lot of 3d applications these days allow you to input actual IOR values in order to achieve a more accurate representation of surfaces during rendering of your 3d models.
The fresnel IOR and IOR are actually linked in V-ray because this is how the materials work in real life. It means that if a material has an IOR of 3 then so is its fresnel IOR as well.
Material IOR Values:
Agalmatoite 1.550 (more…)