Authorities say the incident happened at the business on Harbor Boulevard and Orangethorpe Avenue at 6:04 p.m. The suspect peppersprayed the security guard, who then fired several rounds.
The suspect was apparently grazed in the head by a bullet while fleeing the scene, police said, but he was gone before officers arrived. No one else was injured.
No jewelry was taken. Police are still searching for a suspect or suspects in a dark-colored SUV.