What looks to be a million years old is an authentic Byzantine wedding engagement ring from the 7th Century AD. Made of pure 24k gold, the squareish band features a golden oval face with three figures engraved. Given the height of modernized jewelry-making at the time, and its prevalence in Christian fashion, the figures shown here may have been a representation of the tri-unity of Yahweh: Father, Son and Holy Spirit.
But what do I know? The rings I wear carry stones, not engravings of people. With a ring like this, I can imagine trading it in for something from the Art Deco period.