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Probably not. I did sell some old crap my mom gave me and I got practically nothing offered to me from them. I got a jeweler willing to pay me for them but I still didn't make much.
Yea you'll never get close to retail unless they're signed pieces like Tiffany's or something.
You can try consignment locally or through something like Jewels By Erica Grace or Diamond Bistro but it won't be fast.
Be happy if you get 1/4 to 1/3 of what you paid. And that's probably generous. Most places cannot resell your stuff very easily because a lot of people won't buy "used" stuff. And it's cheaper to make new for them.