The Perth Mint unveiled a coin on Tuesday so rare and expensive it would make any avid coin collector weak at the knees.

The "Discovery" coin weighs in at two kilograms of pure gold and features four Argyle pink and purplish-pink diamonds — the largest being 1.02 carat.

The Discovery gold coin is worth a cool $2.5 million.

Valued at $2.5 million, it is the Perth Mint's most exclusive and valuable collectable coin to date.

The coin actually comes in two parts with the larger coin featuring a hole in the middle, inspired by the holey dollar introduced as Australia’s first official currency in 1814.