As someone who is fairly new to selling jewelry, I can relate to
your problem. When I first decided to sell jewelry, less than a year
ago, (silver wire and bead jewelry mostly) I thought that I should
make very simple, wearable styles that basically anyone could wear.
The problem with that was - these styles are everywhere, so why would
someone buy them from me when they could get them so much cheaper
mass-produced? I have since developed a line of products that people
who have seen my work recognize as mine, and while my newer jewelry
isn't as universally wearable, it sells a lot better because it's
different and because people like buying something from an artist,
and they want a piece to be recognizable as a specific artists'
style. That way when people comment on their necklace, they have a
story to tell - "Oh, I bought it from this local artist, she's just
getting started, and...."
So I say yes, find a style that is yours and that is easy for you to
talk to people about, and that will make marketing about 100 times
easier. We all love making jewelry; most of us hate marketing, so
anything that makes that part easier will make you happier and more
productive, from a business standpoint. Once you have a repuation,
you can probably build on that and add new styles. I don't know,
since I'm not there yet, but....=)