ricardo, to do one of these in poser 4 or earlier, place a camera with focal length = 1 mm at location of gold object, delete gold object, render the scene with that camera, then use that render as the reflection map for the gold object.

what one notices when holding a large flat gold surface next to various coloured surfaces: it reflects red, orange, green and purple rather well, but blue looks almost black, hence one may need to decrease blue value in head-on colour of procedural.