here’s small sample:
I have no idea why there is no black reflection.
Mat is simple diffuse yellowish and fresnel refl.
For silver it’s ok , but gold 
is your reflect color completely desaturated?
yes it’s totaly white
im sure this is correct. Your material isn’t 100% reflective, so its always going to have some diffuse in there.
i wonder how is it possible to achieve this look:
ther is this dark refl.[/url]
just set a black environment…as in those reference photos 
i did an still got yellow color
i don’t know but maybe this is vraymat problem.
I tried mentalray and refl is black.
have you tried setting the diffuse colour to a solid black (or something very close to it)? I guess what you need it’s just tinted reflections, and quite a high fresnel ior.
rivoli it’s closer but now I lost the white reflections coming form lights 
when I make a gold/bronse ill make the diffuse totaly black, and controle the colour from the reflection slot
I guess the reflections colour it’s too dark (or saturated), or maybe the lights aren’t strong enough. maybe both.
it worked when I tried it before, but maybe it’s too pale compared to your material: