In J.R.R. Tolkien’s The Silmarillion, the Elven craftsman who created the Silmarils is Fëanor.
Fëanor is one of the Noldor and the eldest son of Finwë, their first king in Valinor. He makes the three Silmarils, jewels that preserve the light of the Two Trees of Valinor. Their beauty and sacred light make them the most prized objects in the history of the Elves.
After Morgoth destroys the Two Trees and steals the jewels, Fëanor swears an oath to recover them. The oath leads him and many Noldor to leave Valinor for Middle-earth. His decision contributes to the Kinslaying at Alqualondë and the tragic wars of the First Age.
Fëanor is sometimes confused with Celebrimbor, who creates the Rings of Power in the Second Age. Celebrimbor is Fëanor’s grandson, not the maker of the Silmarils. Curufin is Fëanor’s son, while Eöl is a separate Elven smith.