Rendering gems with Vray 3.0 beta 2 with bad result


i’m trying to rendering gems With Vray 3.0 beta 2 but the result is not good at all or at least i don’t like it.
I’m rendering some Gems like Chalcedony Rose or similar, what i don’t know is that Vray is not able to render stuff like that or that i’m not able to do it?!
If anyone know the exact parameter to set Vray for this kind of things, please help me, for me would be very helpfull.

Thank you.

attached a Onedrive Link of my rendering result and the result as it should be.!AsW5tSar-gV7lQGIY4PVRtcIB6Cn