The incident last summer turned frightening two female suspects produced weapons inside the store, according to witnesses, while three male suspects stood outside, blocked from entering when the store's security system was activated.
Police say one of the women pointed a gun at the owner's 11-year-old daughter. Witnesses told police the suspect repeatedly pulled the trigger, but the weapon "failed to fire."
The two women entered the Asia Gold Incorporated Jewelry Store on Steeles Avenue West at 8:22 p.m. on Aug. 1, posing as customers, police say.
One woman asked the owner if she could view a white gold necklace, Det.-Sgt. Michael Fleischaker said in an update Friday as police asked for the public's help in the investigation.
The owner produced the necklace, at which time the suspect pulled a handgun from her purse and demanded that the owner hand over the necklace, Fleischaker said.
At the same time, a second female suspect pulled out a stun gun, he said.
York Regional Police on Friday released surveillance video of the incident and said both women appeared to be 22 to 27 years old. One stood out as wearing a black, grey and white shawl with a large lightning bolt design on the back.
Police say the women grabbed jewelry before leaving the scene with the three males in a black, four-door BMW.