First, you get an abstract of judgment. There are many formalities you need to follow.
There is absolutely no reason to do this yourself. If you make a technical mistake you could wind up on the hook. Also, you can get the jeweler to pay for your lawyer.
You won't have any trouble finding a lawyer to collect against a jeweler. You won't have to pay anything up front and you will get more with a lawyer than without.
Any civil lawyer would help you and any civil lawyer will get you more in your pocket than you would get yourself.
I can't imagine a more ideal situation than collecting a judgment from a jeweler. Maybe someone that has a money tree in their backyard. Maybe.