Often created with hand crafted art methods that few use anymore due to new jewelry making technology that's faster and cheaper. Handcut stones, handcarved bands, you can feel the unique work done by someone's hands a very long time ago, kept intact by the most precious stones and metals which keep their beauty for generations.
For history and design and art nerds, vintage jewelry represents design trends from a different time and feel, created in a style moment everyone at that time was living in, which can be felt in each piece
And if you prefer something rare over something everyone has - There are only a certain number of historical engagement rings on earth with their original stones still intact, and the farther back we go the more rare they are.