The men barged into London Jewelers at Wheatley Plaza in Greenvale around 4:30 p.m. Saturday.
The suspects used a sledgehammer to break display cases and remove luxury watches and other jewelry.
No one was injured.
It is not clear how much the stolen jewelry was worth.
ALSO READ | 'Statistically significant' cancer levels found in Suffolk County School District: study
'Statistically significant' cancer levels found in NY school district
----------
* More Long Island news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube
Submit a tip or story idea to Eyewitness News
Have a breaking news tip or an idea for a story we should cover? Send it to Eyewitness News using the form below. If attaching a video or photo, terms of use apply.