Star Locket

The Star Locket is a star-shaped music box that Princess Serenity gave Prince Darien on the Moon. When opened, a melody plays while the crescent moon in the center lights up, and slowly rotates around a starry-clouded sky panning background.

1,000 years later (in present day), Tuxedo Mask dropped this item in battle, but decided to let Sailor Moon keep it.

When Darien was brainwashed by the Negaverse, Sailor Moon uses the melody of the locket to unlock his memories and remove the negative energy from his heart.