Michaela Dietz (born November 1, 1982) is an American actress and voice actress who is best known for voicing Riff on the PBS children's television series Barney & Friends, Amethyst on the Cartoon Network series Steven Universe and it's follow-ups Steven Universe: The Movie and Steven Universe Future.
For Nickelodeon, she voices Ariel in Middlemost Post and Bex on Super Duper Bunny League.