While they don't buy gold for cash in-store, Jared offers trade-in programs for specific items:

Create an account on the Jared Gold Exchange website to request a "Gold Exchange Packet".

If you accept, a check is mailed within two business days. If you reject the offer, your items are returned to you for free. What They Accept (and What They Don't)

Jared only pays for the metal content. You must remove all diamonds and gemstones before shipping, as they will not be returned or compensated for if you sell the gold. In-Store Trade-In Options