Sterling silver 925 over bronze genuine coral ring size 8 adjustable

This is a beautiful genuine, coral sterling silver over bronze ring. That is size 8. It is adjustable as one side of the band near the stone does adjust because it is not soldered to the underside of the stone. This is stamped 925 however it has been tested and there is a spot on the back of the band from the scraping from the testing where you can see the bronze underneath the silver. It is a very small area maybe an eighth of an inch long. So I am selling this is a costume jewelry piece even though it does have a genuine stone