Actually I have seen a De Rosa labeled Diamanté as a model name. Just once - and it looked identical to a Primato.

They did have a track model - and I do remember the aero one during that craze. I remember the aero braze on for shifters, I don't remember other differences. Generally speaking, you can call it a professional, a Giro...etc., but they are De Rosas. SL, SLX. The aero one is a little seen exception. They're De Rosas. They may have assigned models based on parts at some points and in some markets. The frames are De Rosas.