I have a couple of suggestions for selling jewellery
1) Get together with local party sales reps. There are often wellness or beauty evenings where you could have a table of jewellery, particularly in the run up to Christmas
2) If you're in a large city ask at big offices of lawyers, accountants etc. They often support a local charity and might have charity raising events at lunch time. (Again party sellers might know about these events). You can usuallu have a table if you give a percentage of sales proceeds to the charity.
There's an article about creating a jewellery display here
. That's me in the photo
You can usually buy inexpensive display stands and gift boxes on eBay.