It says Gold filled so that means it's not gold it's more like gold covered and it may be difficult to size it up I think because it's not though they would have to fill it with gold or silver and it won't match the actual ring at least that's what I was told when I was trying to get a ring size that was just Gold filled but that's not my ring I just happened to see your message and I remember what happened to me when I went to a jeweler with the same question about a gold filled ring. At least I hope it helps.