You'd know to it if you had one of these coins in your pocket. Diamond shaped and 22-carat gold, they're a commemorative coin for an "historic year in British royal history".
However, the new editions are aimed at coin collectors rather than being a new addition to the country's currency. And as there are only 5,999 being struck, you may be lucky to catch a glimpse of one.
Hailed as the "world’s first collection of diamond shaped gold sovereigns", the design of the coin has been created to mark the 125th anniversary of Queen Victoria's Diamond Jubilee. She was Britain's second longest reigning monarch.
