Published: Sep 27, 2013 5:01 PM EDT

NAPLES, Fla.- Naples Police are searching for the suspects accused of selling a jeweler a fake diamond for $12,000.

Police say an older woman and a male companion, possibly between the ages of 50 and 70, offered to sell the "diamond" to Aragon Jewelers on September 21. The stone looked like a round European cut diamond. After examining the alleged diamond under a microscope and weighing it, the victim agreed to pay $12,000 in cash for the stone. The suspects returned to the store on Monday to finish the transaction. The two left the store in a blue or black BMW 550.

Later that day, the supposed diamond was tested and found to have no value.

The investigation continues. If you have any information, you are asked to call Southwest Florida Crime Stoppers at 1-800-780-TIPS.