Diamond Tiara

Diamond Tiara is a school-age pony and a classmate of Apple Bloom who first appeared in Call of the Cutie.

Personality
She, like Silver Spoon, is a bully who calls ponies without cutie marks "blank flanks", and deems them to not be special. She has a snooty and stuck up personality and enjoys belittling others.

History
In Call of the Cutie, Diamond Tiara and Silver Spoon invite Apple Bloom and Twist to their cute-ceañera, a party for those who have recently earned their cutie marks, so that they and the other party attendees can mock both of them, because they have yet to earn their cutie marks. Twist manages to gain her cutie mark after finding her talent (making candy), but, unfortunately, Apple Bloom didn't earn hers before the party.

When Apple Bloom tried to hide her lack of cutie mark from the ponies in the party with a table cloth, she bumps into the two guests of honor, Diamond Tiara and Silver Spoon. Apple Bloom lies, claiming she got her cutie mark earlier, and says she doesn't want to show off and take attention away from the party's guests of honor. Diamond Tiara replies that she didn't want to see Bloom's cutie mark anyway. As Apple Bloom prepares to leave, her makeshift dress shifts, exposing her flank. Diamond Tiara and Silver Spoon witness that it's blank and doesn't hesitate to make fun of Apple Bloom, who is soon joined by two other blank flanks. The teasing gets ignored as the adult ponies explain that being a blank flank means still having many possibilities open. Diamond Tiara is later seen watching the other ponies play the party activities from the stairway, standing alongside with Silver Spoon.

She appears again along with Silver Spoon on stage at the talent show in The Show Stoppers.

Trivia

 * A tiarais a form of crown that is often worn by royalty.