I had been looking for an earring holder that was different from the standard kind I usually see around here that just has holes all over a metal surface. I ordered a harp-shaped one with this same basic setup, but it was so large and I wanted something that didn't take up a lot of space on my desk. This holds plenty of pairs for me, and the holes are actually large enough that you could fit most pairs of earrings through one hole instead of two if you wanted to maximize the amount it holds.
It might be a little hard to work with if you have larger hands, but mine are small and can fit through the spaces between the rows to put in and take out whichever pair of earrings I want.