The Rainbow Pact (レインボーパクト Reinbō Pakuto?) is a mythical item that appears in the Guardian Angel Of The Sky Series. The Rainbow Pact makes its debut in the first season. The Rainbow Pact is used to collect the legendary Rainbow Tears and turn their power into the legendary crystals once all Tears are collected.
In Guardian Angels Of The Stars, the Rainbow Pact appears along with Purple and Pink, when they arrive at earth. Together with the powers of those two, the Rainbow Pact grants Rubellit and Amethyst the power to transform into Guardian Angels, by shouting "Double Rainbow Painting!".
In the first season, the Rainbow Pact is used to collect the lost Rainbow Tears. After collecting every Tear, the Pact creates the sacred Crystals which the Guardian Angel need to save their world. In the second season, the Rainbow Pact is used by Rubellit and Amethyst to transform into Guardian Angels. The Heaven Crystals still exist in the Pact and the Guardian Angels can use them.