Diamond Tiara was created by Meghan McCarthy, the writer of Call of the Cutie, and was named by Lauren Faust. Chantal Strand tweeted on April 7, 2014 "Reading the latest #MLP script for next recording session! *Spoiler Alert* Diamond Tiara’s mean." On December 8, 2014, Chantal Strand mentioned on Facebook "you all might be seeing another side of DT soon", in reference to Crusaders of the Lost Mark.