Azurite

Happy go lucky gem. She is somewhat too selfish and obsessed by herself for her own good, but Tourmaline is here to put her back on her rank. She really likes to sing, and once sang for Rose Quartz, wich was a really great honor for Azurite. She is also naturally sparkling.
Her favorite gems to fuse with are Tourmaline (with a reserve) and Fluorite.
When Tourmaline and Azurite worked for Yellow Diamond, a long time ago, they were forced to fuse for a long time because they power combined could enslaved planets. 
Her weapon is a magical staff who allow her to summon stars to fight with.