It's worth something, but the value is pretty ranged. Currently, most EMs perform weddings and gift engraved rings. First thing to do is test if it is a newbie-ring or if it can be locked down outside a container. If it can be locked down directly, that helps the value. I'd personally estimate you might get about 5m for it if it can be locked down because the engraving isn't going to be universally desirable. I have seen really, really nice engraved rings hit about 20m. Hope this helps!