Aquamarine

Aquamarine (2006) is a fantasy, romance, family directed by Elizabeth Allen Rosenbaum rated 6.5/10.

Two teenage girls discover that mermaids really do exist after a violent storm washes one ashore. The mermaid, a sassy creature named Aquamarine, is determined to prove to her father that real love exists, and enlists the girls' help in winning the heart of a handsome lifeguard.