Many of the jewels have never been found. Charges against the men included armed robbery in an organized gang, association with a criminal enterprise and receiving stolen goods.
Four men dressed as building painters entered the store near the Champs-Elysees, a popular tourist area, by a service entrance in 2007, tying up staff and stealing 360 items of jewellery and 120 watches, according to judicial documents.
"Look at all the TV series of jewel heists, where you have people wearing masks, flak jackets. And here, we have stockings and high heels," defense lawyer Eric Dupond-Moretti told reporters.
A security guard for the boutique is among those suspected of participating in the heists. The lawyer for guard Mouloud Djennad said his client is hoping to find some "serenity" after the trial.
Some stolen jewels were found when police rounded up 25 people in a 2009 sweep. In 2011, 19 rings and three sets of earrings worth a total of USD 20.4 million were dug out from a Paris-area rain sewer near Yahiaoui's house, authorities said.