The 31st Summer Olympic was held in Rio de Janeiro, Brazil. Rio became the 1st South American city as well as the 1st Portuguese-speaking city to host the Olympic Game. A set of “Rio 2016 Olympic Games Commemorative coins” is issued to memorize the significant Olympic Game. The coins are 16 in total, divided into 4 groups. A unified specification is required on the material, face value, weight, diameter, etc. Tournament item or Olympic Mascot is printed on the face of the coin, to witness the glory of the Olympic Game.