Swamp Women (1956) aka Swamp Diamonds (repost)

An undercover policewoman helps three female convicts escape from prison so that they can lead her to a stash of stolen diamonds hidden in a swamp.

Director:

 Roger Corman

Writer:

 David Stern (screenplay)

Stars:

 Marie Windsor, Carole Mathews, Beverly Garland - via IMDB 

https://archive.org/details/SwampDiamonds