I have old jewelry I'm working to sell. Here are the tips I've read.
* start with friends and family. You never know who might want something, if only as a present for someone else.
* then go to Craigslist, but of course meet in a public place for safety. Get cash.
* third, ebay and etsy. More scammers that way but a wider audience.
* fourth, if all else fails, a pawn shop / jewelry shop. But they'll give you the worst prices.
So I'm on the family level of things right now with my jewelry. I also finally found a jewelry store near me which will give me rough estimates of the worth of some of these pieces without the $85 per item charge they initially wanted.