At 10:11 a.m. Sunday, officers were dispatched to the Costco Wholesale store at 300 Vintage Way on a report of a burglary.
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According to police, the three suspects entered the store wearing surgical masks, then used a hammer to break a glass display case and steal jewelry.
The suspects fled the store in a getaway vehicle before police arrived. The vehicle is described as a dark-colored, four-door sedan similar to a Chevy Sonic, with paper dealer plates, police said.
According to police, no weapons were seen on the suspects and no one was injured during the crime. Police have not located the suspect vehicle, police said.
Anyone with information about this crime is asked to call Novato police at (415) 897-4361.
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ABC7 News contributed to this story.