Bamali disclosed the shocking revelation on Thursday at the Africa Gems and Jewelry Exhibition and Seminar, in Abuja.
The Ambassador, who did not give details of their offences, also advised Nigerians travelling outside the country to always follow the proper channels.
“One area that was left out by the Honourable Minister was the consular issues. I am very delighted that all the key stakeholders are here in this forum.
“It’s a very serious issue for Nigeria because in Thailand alone, we have close to 1000 people in jail, which is very embarrassing to our country.
“So, I am craving the indulgence of the organisers of this event to counsel genuine investors, so that at least whenever they are traveling outside Nigeria they should go through the proper channel,” the Envoy said.
Bamali, however, assured facilitation of partnership between genuine Nigerian investors and Thais, whom he described as advanced in gems and jewelleries.