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A Blue Crystal Necklace

In Season 3, Bella replaced Emma, who left to go travel the world with her parents. In the previous seasons, the three mermaids: Emma, Cleo and Rikki wore lockets to help them remember how special they were, and presumably Emma continued to wear hers. However, the new trio replaced the lockets with jewel pendants, with stones found inside the rocks of the walls of the Moon Pool. When in contact with each other, these crystals generate enough energy to cause power outages, and a blue light that mesmerizes the girls in the same way as the Full Moon.