Necklaces were accepted for masculine people since pretty much forever, though unfortunately nothing particularly extravagant — nobody can stop you, though. Same thing with arm bands and rings. For a while ear piercing was frowned upon, but that's done since at least the nineties. Nose piercing works perfectly fine.

In other words, wtf are you talking about, you get to wear as much jewellery as you want. I mean, you're not obligated to, and limiting yourself to a watch is a nice, minimalist concept, but even then whether it will read femme, masculine, or anything else, really depends on the watch, and, uh, almost everything else. Including who's doing the reading.