I've failed to find a nickel gold alloy with such a small amount of gold ("0.4g" according to the website) that still looks gold/yellow - 'white gold' which is

I've failed to find a nickel gold alloy with such a small amount of gold ("0.4g" according to the website) that still looks gold/yellow - 'white gold' which is a gold-nickel-palladium alloy has a magnitude more gold in it than that and nonetheless looks silvery. I suspect this is a coated surface, with the coating being easily vaporized by a 405nm pulsed laser.