Insurers Lloyd's of London is offering a reward of up to €1 million ($1.3 million) for information that will lead to the recovery of the jewels stolen from an exhibition in the French resort city of Cannes last month.

"A reward of up to €1 000 000 pro rata is offered to the first person who provides information which leads to recovery of the goods. Offer subject to certain conditions," the insurer said in a statement Tuesday.

The robbery took place July 28 at a jewelry exhibition in the luxury Carlton Hotel - the third gem theft around the city since May.