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You have no choice, but to sue him in small claims court. You can pick up the forms at your local courthouse, and do this yourself. You have your receipt and your dates. Just file the case, have him served as they suggest at the courthouse (I would use the sheriff or a professional process server) and then, present your case in court.
If this jewelry store is a family business, you could serve the owner. If it is a corporation, then you need to serve the registered agent, which you can find at the Florida Secretary of State website.