Two more people have been charged over a theft at the Louvre Museum last month, the Paris prosecutor's office said.
A 38-year-old woman has been charged with complicity in organised theft and criminal conspiracy with a view to committing a crime. Separately, a man, aged 37, was charged with theft and criminal conspiracy. Both denied any involvement.
Two men who had previously been arrested were already charged with theft and criminal conspiracy after officials said they had partially recognised their involvement in the heist.
Jewels worth €88 million (£76 million; $102 million) were taken from the world's most-visited museum on October 19.
Four men carried out the lightning-quick daylight theft. Two of the alleged thieves - who had been arrested earlier - later admitted their involvement.
The French public is relieved to see quick progress in the investigation - but many see the whole episode as a humiliating embarrassment for the country.
On Saturday, the woman who has been charged was in tears as she appeared before a magistrate and confirmed that she lived in Paris's northern suburb of La Courneuve, a journalist working for the AFP news agency reported.
The 37-year-old man - whose identity has also not been revealed - was also ordered to stay in pre-trial detention. He is known to the French justice system for past robberies.
On the day of the heist, the robbers arrived just after the museum opened to visitors using a stolen vehicle-mounted mechanical lift to enter the Galerie d'Apollon. They used a disc cutter to open display cases housing the jewellery and were inside for only four minutes.
Despite one crown being dropped during the escape, seven items remain unaccounted for, raising fears they may have already been transported abroad.
The incident has prompted an urgent reevaluation of security measures at the Louvre, where it's been revealed that crucial surveillance systems were inadequate at the time of the crime.
