With the glass ceiling all but shattered, women in the workplace — specifically in the c-suite — face yet another barrier that separates them from their male counterparts.

A recent study from career website Glassdoor reveals that just seven of the 100 companies with the most extreme CEO-to-worker pay ratios employ women as their chief executives. That’s a 7% rate.

Call it the diamond ceiling.

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“At the top, where there is transparency, which I think is really important, there seem to be much less sign of discrimination,” said Ariane Hegewisch, Study Director at the Institute for Women’s Policy Research. “Where there probably still is a lot of discrimination, and where the work-life stuff comes in, and women being more likely to take time off, is whether you get to that point of being a CEO.”