I would dearly love to see a story that revolves around the history of the Elessar jewel, with Aragorn as a focal point. Doesn't mean he even has to be in it but he should have a central importance in the story.
I don't care if there is one version of the jewel or two, as you wish. Shoot, you could write a Fourth Age investigation into the provenance of the one Aragorn possesses.
Things that have been running through my head that I would love to see if it fits for you: Earendil, Vingilot, the Great Eagles, Celebrimbor, Gondolin, and a hobbit (an adventurous Took?).
ETA: You could have Merry and Pippin do the investigating after they return to Minas Tirith when they're elderly.
The Elessar jewel, Aragorn, gen
I don't care if there is one version of the jewel or two, as you wish. Shoot, you could write a Fourth Age investigation into the provenance of the one Aragorn possesses.
Things that have been running through my head that I would love to see if it fits for you: Earendil, Vingilot, the Great Eagles, Celebrimbor, Gondolin, and a hobbit (an adventurous Took?).
ETA: You could have Merry and Pippin do the investigating after they return to Minas Tirith when they're elderly.