Thanks for investigating, CutiePie...it's definitely not the DAR pin, but I went to the ZTA website to check that one out. It said that one of their colors is turquoise, and the enamel on this pin could be considered turquoise, I guess, but the lady on it doesn't look like the Zeta Lady.
Good try, though! I appreciate it. I'll let you know if I find anything out.