Need help figuring out a material setup

[jsuarez388]

I've been trying to figure out how to make this kind of material:

Screen Shot 2016-02-16 at 4.43.06 PM.png (57.78 KiB) Viewed 898 times

Not talking about the Metal material, but the white line on top of it. I tried the old C4D way, where I have the Metal Material as base and on top is the white with a black to white gradient in the opacity channel. No luck, I don't know if it's because these are Octane materials, but they do not interact with each other, the material farther to the right is the one applied and the others are ignored. Also tried a Mix material, but no luck either.

And I am assuming the only solution CANNOT be polygon selection.

Here's a screenshot of my test

[aoktar]

Here is a sample setup for you.