Pictures posted on social media showed a series of gold sovereigns bearing Isil inscriptions, and with a reported value of one gold dinar being with $139 (£89).
Designs due to be embossed on the gold coins included a symbol of seven wheat stalks - a Quranic reference - and a world map.
The currency will be put into circulation in the near future.
Currently, Dinar is the official currency of Algeria, Bahrain, Iran, Iraq, Jordan, Kuwait, Libya, Serbia, Macedonia and Tunisia.