“Fëanor grew swiftly, as if a secret fire were kindled within him… Few ever changed his courses by counsel, none by force. He became of all the Noldor, then or after, the most subtle in mind and the most skilled in hand… and he it was who, first of the Noldor, discovered how gems greater and brighter than those of the Earth might be made with skill.” - The Silmarillion, Of Fëanor and the Unchaining of Melkor