in eregion the craftsmen of the gwaith-i-mirdain , the people of the jewel-smiths , surpassed in cunning all that have ever wrought , save only feanor himself ; and indeed greatest in skill among them was celebrimbor , son of curufin , who was estranged from his father and remained in nargothrond when celegorm and curufin were driven forth , as is told in the quenta silmarillion .