Ruby Gem

The Ruby Gem is one of the magical Starfire Gems. It enables its user to summon the "Mesmer-Disk", a weapon that can hypnotize any living being.

History
Frustrated with Master Hikita's decision to make Princess Tenko the Master Guardian, Jana and Jason attempted to steal the Starfire Gems from the Tenko Box while the other Guardians slept. Jana stole the Amber Gem for herself and gave the Ruby Gem to her brother. Jason has used the Ruby Gem on nearly every confrontation with Tenko and the Guardians.