Published: Aug 08, 2014 2:54 PM EDT
Updated: Aug 08, 2014 6:12 PM EDT

NAPLES, Fla.- $10,000 worth of jewelry stolen! Tonight, Naples police are looking for a man who swiped three diamond pieces from Provident Jewelers on 5th Avenue in downtown Naples. One of the managers says this guy was a professional.

"We tend to run into folks who aren't coming in with honest intentions," said Store Manager, Corrina Keller.

Naples police say thousands of dollars worth of jewelry was swiped from this Naples Jewelers.

"He said he was in to buy some things for his grandmother, he said it was family members pulling monies together to do this."

But, that story--false. The police report says the thief who identified himself as Anthony Rivera, had other intentions, after looking through the jewelry inside the half priced treasure chest at Provident Jewelers.

"When they are a professional there are many ways we have to keep ourselves educated on to keep ahead of the game with these not so honest people," Keller told WINK News.

Even with a jeweler standing watch, he was able to sneak three pieces inside of a black folder.

"He knew exactly what he was doing, one little turn of the eye to the left and that's where he was very nonchalantly pushing them into this back leather folder."

WINK News has pictures of the missing items. One is a yellow gold diamond tennis bracelet, another is this yellow gold diamond necklace and also these two princess cut diamond earrings-- equaling $10,000.

"We want to catch this guy, get our items back so he doesn't do that to another honest jeweler."

But how was this crook able to fool the system? Store Manager Corrinna Keller says he was a professional. It took them looking at video surveillance to find out how he was able to get away with the crime.

"There is people out there that will take advantage and are not honest."