A History of the Silmarils in the Fifth Age

The Silmarillion describes the fate of the three Silmarils. Earendil kept one, and traveled with it through the sky, where it became the planet Venus. Maedhros stole another, but regretted his deed and jumped into a fiery chasm. And Maglor took the last one, but threw it into the sea in despair.

Well, Venus is still around. But what happened to the latter two? Surely over all the intervening millennia, with so many people wanting a Silmaril, they haven’t just hung around in the earth and ocean?

After some research, I’ve developed a couple of promising leads for the location of the Silmarils in the Fifth Age.