|Cutie Mark:||3 diamonds|
Lonsdaleite has pink hair and eyes and a yellow coat. Lonsdaleite's cutie mark is three diamonds. Lonsdaleite is the only pony to wear a watch. She also wears a black and white top.
Lonsdaleite made her debut appearance in The Cutie Mark Chronicles. Lonsdaleite is a teacher/examiner at Princess Celestia's School for Gifted Unicorns. Lonsdaleite has only made one appearance throughout the whole My Little Pony: Friendship is Magic series, meaning her first appearance was her last appearance.