Here you an example. I found that the problem could to be the fog color in vray material. Maybe because in Corona there's no value like that, in fact I had problems achieving the same effect on another scene, building the material from scratch. I tried to change the refraction color, but it will affect also the "amount [level] of refractiveness", I ended up with too much a bright color.
Settings in the hidden tabs are at default values.
Thank you for the support