Odds of Hanging On
If you have a decent eye, are good at your job, and develop a rep for being honest, then you'll always have work. You might have to move shop to a wealthier area if the economy sours, but chances are there will always be people shopping for wedding rings—after all, a diamond is forever.
Make some big errors that cost your boss, though, and you'll be polishing the cubic zirconium at Macy's.