Those rings are gorgeous. I wish they would update NamUs with pictures of them, and the clothing. The rings look old to me-not antique, but well worn and periodic, like from the 80s or 90s. The signet ring looks like it should have another gem diagonally across from the other one, like maybe it should have a twin but maybe broke off? I'm going to bow out of the discussion on what the initial is, I'm terrible with deciphering fonts/scripts.
If those remains were older, there would be a lot more possible matches out there-there were a lot of girls/young women who fit that description who went missing from PA, and neighboring states, in the 70s, for example.
Do they do automatic dental chart comparisons like they do DNA in CODIS?