Mako Mermaids S1 E17: Moon Ring 2 (short episode)

When Zac finds a ring on the ocean floor and gives it to Evie, Sirena sees it is a Moon Ring, and the mermaids attempt to recover it before Evie wears it in

Prime Video: Mako Mermaids, Season 1

Mako Mermaids (TV Series 2013–2016) - Episode list - IMDb

Season 1 (Mako: Island of Secrets), H2O Just Add Water Wiki

Mako Mermaids: Moon Ring 2, S1 E17

Mako Mermaids (TV Series 2013–2016) - Episode list - IMDb

Prime Video: Mako Mermaids, Season 2

Watch Mako Mermaids: H2O Adventure: Volume 1

Watch Mako Mermaids: An H2O Adventure

Mako Mermaids (TV Series 2013–2016) - Episode list - IMDb

Prime Video: Mako Mermaids, Season 1