Glass with refraction - how?

[Raenfox]

Hello,

I'm using Octane with C4D and I'm trying to create a solid transparent crystal ball, but I can't get any refraction into the material (right part of attachment). I tried every setting and could not get it to work.
C4D's materials create refraction just fine (left part of attachment), but those don't work with the Octane renderer.
What do I need to do to introduce refraction, like on the left example in the attachment, into transparent materials in order to create realistic glass/crystal?

[mitchino]

create a specular material, set index of refraction to around 1.5