Re: most "gold" looking gold finish?
It depends what gold you're going for. Even with Jewlery- there's a difference in color between 10k, 14k and 24k gold.
The only guitar finish with real gold were a few Fenders that were covered in gold leaf- but gold leaf gives a different look than gold plated metal.
Gibson's "gold tops" were originally bronze powder mixed in with the laquer.
There are some finishes that emulate gold plating.