Michaela Dietz (born November 1, 1984) is a Korean-American actress and voice actress. She is perhaps best known for providing the role of Riff on Barney & Friends and the voice of Amethyst on the Cartoon Network television series Steven Universe.
Since she was young, people frequently commented on her low, raspy voice. After college, she was studying acting in NYC. She saw a VO audition posted online and left a message on the casting director’s voicemail. She didn’t book that job, but the director remembered her and called her in to voice a character for a video game. Shortly after, Dietz was able to become a series regular by getting the role of Riff the dinosaur. She continues to voice act to this day.