It is slots instead of holes, but my daughter is using it for studs as well as hanging earrings… Easy to modify to tighten up the design if it has too much space for just studs. I didn’t add my plans but the original inspiration is linked and I’d be happy to share my version if it was useful.
Also, if you are even moderately comfortable in Inkscape/Illustrator/the like, it is a pretty straightforward pattern to create…