A Stranger Among Us (1992)

Synopsis
When a Jewish jeweler is found dead and his store is missing more than one million dollars in diamonds, a New York police detective (Melanie Griffith) goes undercover in a community of Hasidic Jews to find the criminal. Once she is immersed in the community, she falls in love with one of the most devout members, who helps her find the criminal. ~ Stephen Thomas Erlewine, All Movie Guide