and when all was done , and the minstrels of elves and men had made lament , telling of the valour of turambar and the beauty of niniel , a great grey stone was brought and set upon the mound ; and thereon the elves carved in the runes of doriath : turin turambar dagnir glaurunga and beneath they wrote also : nienor niniel but she was not there , nor was it ever known whither the cold waters of teiglin had taken her .