A fourth member of the so-called Pink Panther gang of international jewel thieves was arrested late on Friday.
Police said that the 26-year-old was arrested in the Athens neighborhood of Kypseli.
Like the other three suspects arrested earlier on Friday, he is also a Serbian national.
Officers recovered a fake Bulgarian identity card and driving license from his apartment, a replica gun and a ski mask.
The gang is believed to be behind more than 30 jewelry store burglaries in Attica alone, netting a total loot in excess of half a million euros.
It is also thought to have carried out robberies in Britain, Dubai, Japan and Switzerland.