I have questions or thoughts on the possibility of a ring inscription or initials. If the ring was sized up, that process would have involved a cut through the lower portion and adding sizing stock etc. so it may not have ruined the engraving, depending on what it was, but it’s obviously not there in 1990. I was reading about reagents and techniques to recover marks and things on metal plates and old gold/silver items and it seems like maybe that could be an option? Ultrasonic imaging was used to give an almost clear picture of a key brand that had been “removed” by grinding. I wonder what, if anything, was done to check for an inscription.