J.R.R. Tolkien described the Noldor as the creators of the palantíri.
The palantíri are powerful seeing-stones used for communication and observation. In Tolkien’s history, the Noldor made them in the Undying Lands, and the Elf Fëanor is associated with their creation. Elendil later brought several stones to Middle-earth after the destruction of Númenor.
The stones were placed at important locations in Arnor and Gondor. Their use became dangerous after Sauron captured the palantír of Minas Ithil and used it to influence or deceive its viewers. Denethor II used the stone of Minas Tirith, which contributed to his despair during the War of the Ring.
The Noldor should not be confused with the Sindar, another major Elven people. The Dwarves and Ents also have important roles in Tolkien’s world, but they did not create the palantíri.