I just assumed it was SS. If it's gold plated then ya there is nothing you can do.
Recommending someone use Cape Cod should be done after some vetting as they may easily make things much worse if attempting to fix the scratch themselves with CC or any other method.
Some indications on how to know where you stand is that if you cam out your strap or caseback screws, you let the screwdriver or springbar compression tool slip and scratch the case, you scratch the backside of the lugs with the springbars like on so many poor Rolex, you dent the caseback notches using incorrect spanner wrench inserts, and so on, then you really have no business polishing a watch or doing any other watch repair or maintenance.
Scratches are a normal part of life and improve the look of the watch in my opinion, so just let it happen and by the time it's scratced up bad enough to warrant a service and refurbishing you can just buy a new rep of the same watch and start fresh