The Silmarils are powerful jewels made by Fëanor that are infused with the radiance of the Two Trees of Valinor.
Official Description[]
The Silmarils are three jewels wrought in the First Age by the greatest elven craftsman, Fëanor. Works of unparalleled beauty, these jewels are filled with the radiant light of the Two Trees of Valinor. But they were stolen by Morgoth, who coveted them for their beauty. After his defeat, two of the Silmarils were lost, and the third was set in the sky as a star.