I think that it is OK to make things that only appeal to a small,
exclusive group. The thing is, you may want to devote time/energy
to defining the characteristics, behavior and habitat of that group,
so you can go where they are, speak their language and sell to them.
You may also want go gather contact about your current
customers, both to aid you in this endeavor and so you can continue
to cultivate them. Do sell directly to your customers? If not, how
do you know who they are and what they want?
What are some common characteristics of your customers? Social
class? Education? Gender? Special interests?
Why do people buy your jewelry? Some buy jewelry in order to
conspicuously display their wealth, some buy to display their
artistic sensibilities or taste, some buy because of a percieved
spiritual or metaphysical connection with the piece, etc. If you can
define the motivation, you use that in your marketing.
Trying to ape percieved fashion trends in one's work does not sound
like it would be fun for you (it wouldn't be for me, either,) and
it would tend to work against your developing a recognizable style
and body of work. Better to find out what kind of people buy your
work, why they buy your work, and where/how you can meet them.
My 2 cents from someone who should be doing more of this himself