A Mysterious Gem – Brilliance is within you!

Zakuro takes Ichigo to the rehearsal of a jewelry company premiere where she befriends a clumsy crew member named Tsukiko. Tsukiko really wants Zakuro to wear a rainbow stone necklace for the show, but both the stage manager and Zakuro reject it for being too modest. Ryou, Keiichiro, and the aliens all believe the stone is made from mew aqua.

Synopsis excerpt via Kitsu.