You've probably thought one way or the other if there was a different color of this so called GOLD yet gold.
Anyways let me clear you of the doubt, there is only a reddish yellow color with we all know as gold or probably seen. well there are what we call as "alloys". Although gold is an alloy but then when these alloys are mixed with some other metals we can create a color of gold that we like. so basically we could have a different color of gold but then it wouldn't be real and original like the real gold alloy.
This basically means that any other color of gold has every tendency to tarnish and fade.