Gold was a color. Gold items were described as golden.
The flag of Germany had a band of gold. (TNG: "The Last Outpost")
Mark Jameson referred to his wife Anne Jameson as "Annie with the golden hair". (TNG: "Too Short A Season")
As a child, Guinan had an imaginary friend that was a Tarcassian razor beast. According to her, "It had dark brown fur and gold eyes and huge spiny wings, and it would fly so fast nobody could see it except me." (TNG: "Imaginary Friend")
When Miles O'Brien was able to quickly figure out how to repair a field transporter and successfully escape with several survivors from the surface of Setlik III, he was quickly promoted to tactical officer on the USS Rutledge, which was ultimately how he got the operations division gold suit. (DS9: "Paradise")
In 2374, Harry Kim saw a dozen shades of red and gold in the geological formations on a Y class planet. (VOY: "Demon")