[The Saucepan Man]

There is an interesting discussion of Bombadil's brooch here.

This suggest to me that this was worn by some beautiful Elven lady in the First Age

As noted in the thread linked to above, the brooch is more likely to have belonged to a lady of the race of Man, as the Barrow-Downs were used as burial sites by the Edain in the First Age and by the Kingdom of Cardolan in the Third Age.