Smash-and-grab robbers in New York City stole a large amount of high-end jewelry in a heist that was caught on video.

The robbery happened at Rocco's Jewelry in the Bronx on Friday at around 2:30 p.m. The business estimates that they lost $2.15 million worth of merchandise in the heist.

The jeweler, which is in the Fordham Heights section of the Bronx and a short walk away from Fordham University, was closed on Saturday while police investigated the scene.

Surveillance video of suspect outside Bronx jewelry store

A suspect approached Rocco's Jewelry before opening the door for the rest of the thieves. (NYPD Crime Stoppers)

Surveillance video shows one of the suspects acting coolly as he approaches the store and waits to be let in.

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After a Rocco's Jewelry employee buzzed him in, the white T-shirt-clad suspect held the door open for three masked men in black clothing. 

One of the thieves is seen using a hammer to smash glass cases as the others shove fistfuls of jewelry into bags.

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Thieves stealing from a New York City jewelry store

The criminals had robbed the Bronx jewelry store by using hammers to smash open displays of high-end diamonds. (NYPD Crime Stoppers)

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The heist - which lasted only around a minute - appears to have been carefully planned. Police have published images and descriptions of the suspects to gather more information.

Video showing suspects running away from NYC jewelry store robbery

Surveillance video shows the four suspects running away shortly after the robbery. (NYPD Crime Stoppers)

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Anyone with information regarding the robbery was urged to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477). Tips can also be submitted confidentially through the Crime Stoppers website at www.crimestoppers.nypdonline.org or on Twitter at @NYPDTips.