Recently found out the Palantíri were gifted to the Numenorians by the Eldar and it’s given me *ideas.* So the Palantir were made by Fëanor right. And it’s safe to assume they were kept by the Fëanorians, unless Maedhros decided to gift one to Fingoflin for communication, but I don’t think that would’ve gone over well for anyone.
So here’s my two theories:
1. Each son of Fëanor has a set of Palantír. I think it’s safe to assume there were more than seven made? I think it’s written that Elendil managed to ‘save’ seven of them, but don’t quote me on that. (It doesn’t really matter, this works either way. Also imagine little Tyelpë on his tip toes facetiming his uncles 🥲)
When their various fortresses fall, most of the Fëanorions manage to save at least one of their seeing stones. When Maedhros and Maglor end up in Amon Ereb alone, they have all their brothers’ Palantir but no use for them.
Enter Elrond and Elros. They come to love them, care for them. And vice versa. When they’re sent to Gil Galad, Mae and Mags send these pieces of their family with them. Maybe they can find some good use for them, a final legacy for Fëanor that doesn’t end in blood. Maybe it’ll keep them safe.
(I’ll go into detail of how they end up in Numenor below)
2. Celebrimbor ended up with Curufin’s Palantir in Nargothrond, and Mae and Mags sent the rest his way at some point before their final Silmaril run. They don’t have anything else, and their nephew deserves something made before madness consumed their family. Something made out of pure curiosity rather than pride that doesn’t have too many bad memories attached.
Celebrimbor appreciates the gesture but has no real use for them. He’s not particularly ambitious as a lord. Doesn’t have any need for immediate long distance communication, and in all honesty would likely be accused of spying if he did start using them (no matter if that isn’t how they work.)
Then he hears that Elros, who he’s gotten to know fairly well alongside Elrond over the years of the War of Wrath, is heading off to Numenor. He decides to give the new King something as a token of their friendship, and to keep in touch with his twin from a distance, the way the sons of Fëanor once did. And unlike many others, they won’t scorn his grandfather’s work.
Elros is managing a pretty large kingdom, so he takes the bulk of them. Elrond keeps one.
Later on, Elrond’s (not used since the death of Elros’ children) is lost in the fall of Eregion when he desperately tried to use it to find Celebrimbor. And of course Elendil manages to bring seven Palantir to Middle Earth when Numenor falls.