There is almost no gold value all. It is a layer an atom or two thick on aluminum. There is little extra value to these replicas and stamp collectors typically do not want them in their collections.
In most stores that sell dinnerware. You have to look at the boxes and see where the country of manufacture is. Cheap stuff will be from China.
Best bet is to do online research and figure out what...
In the Kaya forest there is a gold nugget in one of the trees. Just hop around to find it. The other people who trade don't take gold, so don't bother looking for anymore.