Maybe this goes back to that teaching of how women were created for beauty, and not men?
At least that was what a rav cited in a shiur that I listened to a few weeks ago, where he explained that in shidduchim, a bochur is permitted to request a woman’s photo, but a woman shouldn’t be doing so because men weren’t created for beauty but women were.
Or is this different because men wearing jewelry can also signify social status and resources, like wealth with a gold chain. There are also men who wear Jewish stars on a gold necklace.