In JRR Tolkien's work the Ring of Barahir (RoB) was one of the key heirlooms of the Heirs of Elendil.
There is a relevant passage I recall, (I think it is from "Appendix A" of LotR, but my copy of RotK is not available).
This passage tells the story of the flight of Arvedui, the last King of Arnor (and ancestor of Aragorn). He fled before the assault of Angmar and its Witch-king (later the chief of the Nazgûl). He took ship for the ice-bay and found refuge with the locals (snowmen?). They advised him to wait until later in the year, but he tried to sail home. He was caught by a storm, frozen in, and his ship crushed and sunk. But he left the Ring of Barahir as a pledge of repayment for the food and help he had received.
It was redeemed by the Dúnedain later, and the text goes on to say "thus was preserved the oldest work of men's hands in Middle-earth". (This is quoted from memory.)
And there is the problem. The RoB had been given to Barahir by Finrod Felagund, Elven King of Nargothrond as a token of gratitude for having covered Finrod's retreat, I think from the Battle of Unnumbered Tears. Barahir's son Beren used the RoB to establish his status as an Elf-friend entitled to some respect at his initial presentation to Thingol, and later claimed the aid that Finrod had promised his father during his quest for the Silmaril. Finrod died defending Beren.
But given this origin it would seem very likely that the RoB was made by some Elven craft worker. How could it be "the work of men's hands"? Who actually made it?
It was indeed very old, older than Elrond, as it was given to Elrond's Great-Great-Grandfather. It is indeed one of the symbols of Aragorn's lineage from the First Age, and particularly from Beren and Lúthien.