The burglary happened happened around 4:46 p.m. at Baladna Jewelry in the 4300 block of Touhy Avenue in Lincoln wood, police said.
Three masked suspects smashed the front windows of the store to enter the business, and they stole an amount of jewelry that was not immediately known, police said.
Display cases inside the store were also smashed.
"Several customers were inside the store at the time of the incident, but no physical threats or injuries were reported," a new release from police read in part.
The suspects, who were wearing all-black ski masks, clothes and gloves, fled the area in a black pickup truck, police said.
No further information was immediately available as police continue to investigate.