JERUSALEM (JTA) — An insurance company is offering a $1.3 million reward for clues leading to the recovery of stolen diamonds and jewels owned by Israeli billionaire Lev Leviev.

The $136 million in jewelry was stolen July 28 from a resort in Cannes, France, where it was part of an exhibition on the Leviev diamond house.

“A reward of up to 1,000,000 euros pro rata is offered to the first person who provides information which leads to recovery of the goods,” SW Associates, a Paris-based loss adjuster and risk manager working for Lloyd’s of London, said in a statement issued Tuesday.

The statement, with photographs of some of the stolen goods — two diamond rings, a brooch and a necklace — will be published in the French newspapers Le Parisien and Nice-Matin, and the International Herald Tribune, Reuters reported.

A masked gunman stole the diamonds and jewels from an exhibition at the Carlton Hotel. The thief threatened the exhibition staff and visitors, filled a briefcase with the jewels and fled in an operation that lasted about a minute, police told the AP.

Private security guards had protected the exhibit.

The French hotel’s display about the Leviev diamond house had been scheduled to run through August.