The fourth boss of Vs. Mode. This fairy controls beautiful gems! The sparkle of the jewels she creates makes everyone feel very mysterious. Ruby has a strong sense of responsibility and is very caring and helpful. The other fairies rely on Ruby so much that it's often rumored that she is the true leader of the gang...

In Tetris Attack, she's replaced by Flying Wiggler, and the Jewel World is replaced with a Flower World.

It's also note-worthy that Ruby is the only fairy who has wings... wonder why that is...?