You're probably going to be very disappointed with what you get for it either way. You might have some luck taking your jewelry to a custom jeweler to see about recycling some of the jewels into something new that is more to your taste and/or current styles.
If any of the items might be antiques or vintage collectibles, you might have better luck on e-bay or through an antique shop or a consignment house, especially if there is one that specializes in jewelry.