Now that is an interesting ring! Definitely looks like rose gold cartouche, and that sure as heck looks like the LC skull we all know and love but the really interesting part to me are the shanks because that fleur des lis design although French in essence, still plays a big part in Spanish royal and imperial history. Could be a lot of reasons for the inclusion or imposition of the LC skull but that looks like a real gold ring to me in the yellow too, so however it was made it was not cheap!!