Strange, I would go witht the opposite. I would pick the first one first and then the fourth one second. I think the mother of pearl with the gold is more elegant. I wish all of the choices had a fixed back with the mother of pearl or onyx..
I think your dress truly needs to be a costume that would only been worn for the work. Think Broadway outfits. Apparently, this tax restriction was the inspiration for ABBA's over the top outfits in their heyday.