The robbery occurred at about 3:20 p.m. when two men entered the Diamond Creation Jewelry Store in the 4000 block of Pimlico Drive brandishing a handgun, according to police.
The suspects ordered victims to get down on the floor and hit a victim on the head with the gun. The suspects stole cash and jewelry and left the area in a light-colored vehicle driven by a third suspect, police said.
The two suspects in the store were described as black men in their 30s. One suspect is about 5 feet 1 inches tall with short hair and was wearing a white shirt. The second suspect was described as 5 feet 11 inches tall and was wearing a black hat and shirt, police said.
Anyone with information about the incident is encouraged to call the Pleasanton Police Department at (925) 931-5100.