In all, the pieces stolen from one of Europe's greatest art collections contained more than 4,300 diamonds with an estimated value of more than 113 million euros ($120 million).
Prosecutors believe the thieves sawed through part of a window grating in advance and reattached it to get into the building as quickly as possible during the heist.
The returned pieces will be examined by specialists "to confirm their authenticity and intactness," authorities said.
Pieces still missing include an epaulette on which a precious stone known as the Dresden White Diamond was mounted.