The incident happened Friday around 5:30 p.m.
According to police, the suspects approached a 79-year-old man inside Poxy Jewelry located at 718 Flatbush Ave. and forcibly removed the jewelry from the location before fleeing in an unknown direction.
Anyone with information is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477). The public can also submit their tips by logging onto the CrimeStoppers website.
It happened at the D. Carlos Jewelry on New York Ave. in Huntington Station.
Police say the robbers went into the store at around 7:30 p.m., flashed a gun and stole the assorted jewelry. The value of the stolen items was not released.
Police in Suffolk County are looking for three people who robbed a jewelry store.
Police are offering a reward for anyone who can help them identify the robbers.