Authorities say William Colburn faces charges that include retail theft and tampering with evidence.
Naples Police say the 18-year-old was in the store on Saturday when security saw him remove the earrings from a box, drop them into a bottle of water and leave without paying.
When a security officer approached him outside the store, authorities say the teenager drank the water, swallowing the earrings.
Police said Monday the X-ray confirmed the earrings were inside him. A police spokesman didn't know whether the suspect required medical treatment for having swallowed the earrings.
Police do not know if he has an attorney. A phone listing for Colburn couldn't be found.