Utilizing the 2013 "National Survey of College Graduates" (Scientists and Engineers Statistical Data System, National Science Foundation, 2015), this study examined three measures of labor market outcomes: annual earning potentials; primary work activity; and education-job match for science, technology, engineering, and mathematics (STEM) bachelor's degree holders by their master's degree attainment. Whereas the study found earning differentials across master's degrees, the results suggest that one's earnings are explained by other factors, specifically gender. Results reflect a discernible and concerning pay gap between men and women with the same level of degree attainment in the STEM workforce. Also, implications for policy and practice are addressed.