To be honest, I'd say neither are good for that purpose. I believe Polished Ivory is a matte pigment, so that will not help you for highlighting the face. White Gold (though it is a pretty color), is very chunky in texture, and has a green sheen to it, so again, this pigment might not be optimal for highlighting. I'd go for something like Vanilla or Pink Opal pigment for highlighting. These have a gorgeous gold/pink sheen, and have a good texture to work with.