It is not just a necklace

The thought of Sapphire leaving just like Aqua and Aquamarine did, made Rhea groan.

Why is everyone leaving? What if Aquariel has to leave too?

"I am not leaving, Rhea. I am still a part of you. I was created by the bluestone just like Aquariel was. I am the courageous part of you, created to merge with your water guardian. Although I am a part of you, I can no longer be just your thought."

Rhea sighed. At least she still gets to keep Sapphire with her. But how will she communicate with Sapphire if she is no longer her thought?

"Through your water guardian, Rhea," Sapphire answered.

Rhea sighed. How is she supposed to communicate with her water guardian? She doesn't know how.