By The Nation
The robbery happened at 2.30am in front of the Roi Lung housing estate in Sai Thai Udom Road in Moo 5 village, Tambon Na Klua, Bang Lamung district.
The tourist, Jin Shuai, 33, said he was buying food from a roadside vendor when the motorcyclist snatched his necklace weighing about 9 baht or 136.44 grams.
The motorcyclist was wearing a full-size crash helmet so his face could not be seen.
Police are checking footage from security cameras to hunt for clues.