The tourist filed a report to police earlier this week, saying a Thai woman whom he invited to his room to hang out had stolen his expensive Rolex watch from him and fled, Pattaya News reported.
The man took a bath at his condo while the woman waited in another room but when he returned, the gold diamond-encrusted Rolex was gone and the woman had fled.
The tourist said he did not know the name of the woman as he had just met her at his condo in the Jomtien area of the Banglamung district.
Police Captain Chonlawit Athipansi, deputy investigator at the Pattaya Police Station, said police were attempting to identify and locate the suspect.
He promised the police would retrieve the stolen item.
Despite its popularity among tourists, Pattaya is notorious for robberies, prostitution and tourist scams.