Mirror Image earrings?

Hi, I purchased a vintage (maybe 1980's) pair of Monet clip-on earrings. I should have realized they were not mirror images. I wonder if this is a mistake or intentional. Unfotunately, I cannot find another set like these. Most of the Monet earrings I see are mirror images, opposites, if they have a certain pattern, or a design that is not only a square shape or something.