Seafoam turquoise is a postwar thing (maybe 50s, for sure 1960s), the same timeframe as the vogue for claw jewelry. This turquoise is properly described as seafoam in type. “Rough” is correctly used not for natural-profile stones, or to describe texture of a finished set stone, but rather for the material that will undergo lapidary work–cutting, shaping, polishing–to turn it into prepared cabs/nuggets for setting.
I think this is likely 1960s-1970s.