Diamond was born in Margate City, New Jersey. At the age of 11, she moved to New York City with her mother, Karen Diamond, to pursue a career in the performing arts. There, Diamond attended Fiorello H. LaGuardia High School.
In 2017, Diamond was accepted into the musical theatre program at Carnegie Mellon University. During a high school production, Gypsy, in which she played Louise, an agent saw her performance and signed her. She later got an audition for The Cher Show and booked the role just three days before she had planned to move to Carnegie Mellon and begin her freshman year.
Diamond made her professional debut in the musical television special of Jesus Christ Superstar Live in Concert on NBC as a featured member of the ensemble. She was also the understudy for Sara Bareilles' character, Mary Magdalene.

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