DO NOT bring expensive jewelry on a trip, or anything else that you can't bear to lose. Make certain to carry them on with you. It was stolen from right under their noses at baggage claim. Everything was gone - clothes, toiletries, cameras, you name it. In addition to not packing anything valuable or anything you can't bear to lose, make certain to lock any checked baggage.
Most bags come with small padlocks.
They are also available at hardware stores, travel stores, and major drugstores less than a couple of dollars. A padlock is no guarantee that your bag will not be tampered with, but it is a deterrent. I have had my rolling bag for years and always padlock it. During the ensuing 3 hours, the padlock was cut or jimmied off of my bag, and its contents were examined. Fortunately, I only had clothing in there, and nothing was taken.