Police were searching Thursday for individuals who robbed the De Beers jeweller in central Paris at 11:15 a.m. (1015 GMT) and fled on motorcycles.
The robbery struck one of the luxury trade’s best-known names in the heart of the French capital, in daylight, and ended with the suspects still at large.
The individuals showed weapons during the robbery but did not fire them, Paris police said, adding that no one was hurt.
French media showed videos of black-clad individuals wearing helmets walking on the pavement in front of the jeweller holding guns before the heist, and of motorcycles speeding away.
Reuters also reported that police were searching for the individuals who robbed the store and left on motorcycles.
Investigators had not publicly identified the suspects or said what was taken. The search continued after the midday raid.