WILMINGTON, Del. (CBS) – A new reward has been offered in the theft of an 8,000 carat ruby from a jewelry store in Delaware last year.

The owner of the Stuart Kingston Galleries in Wilmington has newly offered a reward of $10,000 for any information leading authorities to the arrest and conviction of those responsible for a robbery which occurred at the store on November 1, 2011.

Armed with a handgun and hammers, four suspects entered the business and tied up several employees. They smashed numerous display cases and made off with a large volume of high end jewelry and diamonds.

Most notably, a rare 8,000 carat ruby shaped like the Liberty Bell was stolen. The value of the ruby is over $2 million dollars.

The robbers fled in a U-Haul van and were last seen on I-95 north toward Pennsylvania. It is possible the suspects are from, or have connections to, the Philadelphia area.

Anyone with information is asked to call the FBI in Delaware at 302-658-4391. Information will be confidential and can be shared anonymously.