In jewellery trade terms, vintage describes a piece that was made between 50 and 100 years ago. So at the time of writing, all jewellery produced between 1920 and 1970 is technically vintage.

What does it mean when a ring is vintage?

A vintage engagement ring is a conversational term without any defined meaning, although some use the term vintage to mean a new ring styled to look like a ring from an older era. The actual name for this is a reproduction.