Besides for the minhag that one should not wear jewelry on Yom HaKipurim because of the "fear of the judgment" there is also the minhag to not wear gold (even as a decoration on a tallis or kittel) because "the accuser cannot be the defender". Would this also apply to white gold? Would this also apply to fake gold?
i.e. Is this an issue of the reality of the sin of the golden calf (and the reality is that white gold is gold) or is this an issue of what it brings to your mind (by the way it even just looks like gold)?