The Diamond Queen
Some scenes of this adventure serial, released on March 15, 1921, were filmed on California's Santa Catalina Island. Here's the summary of just one episode of "The Diamond Queen" starring Eileen Sedgwick:
"She is called upon to jump from the rails of an ocean liner, in the dead of night, into a rough and shark-infested sea. Rough water had no terrors for Eileen Sedgwick, but sharks were an experience. Needless to say, she performed the hazardous feat herself, and it was marked by the same spirit of courage and daring which is so characteristic of this girl's screen work." – Moving Picture Weekly, January 21, 1921
No copies are known to exist.