If things just suddenly dropped off, I would first ask yourself if you did any changes to your SEO or tags? Sometimes we can accidentally change something that was working.
Other than that, I would also look at the season and ask yourself if maybe this is a slow period for jewelry right now? What was it like this time last year? Is this different or did you also have a lull last November?
Jewelry is tricky. I used to sell more of it and I remember this time of the year was slow for jewelry in my old shop. This was a great time for holiday related items whereas Jan-Mar was when I sold more jewelry items for either valentines day or people gearing up for weddings (my stuff is more bridal themed), or birthdays, etc.