List of gold class ships
From YPPedia
This article lists all of the gold class ships:
These ships are all created at shipyards, as usual for any other ship. However, they first require a design of the appropriate type. These designs are available from trading posts, in exchange for collections of gold box trinkets (plus a "modest" fee). There is a (small) chance to get one of these designs randomly by opening a gold box, but there is no control over what type of design would be awarded in this case.