Craigslist has become a popular target for thieves.
Despite the risks, people will travel around the country to sell expensive items like Rolex watches and diamond rings.
The FBI recently broke up 18 heists from all over the country, CBS Sacramento reports.
The scheme often involved buying the seller a plane ticket and renting a limo before robbing the victim at gunpoint. Stolen were Rolex and Cartier watches ranging from $10,000 to $200,000.