In 1989, Kriangkrai Techamong, a Thai worker, stole jewellery and other valuable gems from the palace of Prince Faisal bin Fahd, where he was employed as a janitor. Kriangkrai had access to the prince's bedroom and hid the stolen jewellery in a vacuum cleaner bag at the palace. It included a valuable blue diamond and other gems, which Kriangkrai shipped back to his home in Lampang Province, Thailand.
An investigation launched by a team from the Royal Thai Police, headed by Lieutenant-General Chalor Kerdthes, led to the arrest of Kriangkrai and recovery of most of the stolen jewellery. Kriangkai was sentenced to seven years in prison, but he was released after three years because he confessed to the crime.