You can be thankful your finger ring is in a definite ring shape. Some of these old rings don't have as pronounced ring shape and every time I post one I have some people who swear it's an automotive part...not a finger ring
Many people don't realize that the process of plating metals is old. In fact, it greatly predates the invention of electricity. The ancient Romans plated (silvered) their coins. Sometimes they even used gold to coat inferior metals.