To scintillate means to sparkle or shine brightly.
When something scintillates, it is usually very pretty and catches your eye.
Examples:
The stars scintillate in the night sky.
Her earrings scintillate in the sunlight.
The water scintillates in the sun.
The disco ball scintillates and makes everyone happy.
The treasure chest scintillates with gold and jewels.
The princess's dress scintillates as she dances.