5 Dollars - Elizabeth II Helios

Cook Islands issued a wave of fractional gold pieces in the late 2000s under licensing arrangements that effectively turned the territory's mint authority into a vehicle for novelty bullion production. These tiny .999 gold pieces were marketed primarily to collectors in Europe and Asia, with mintage controlled by the issuing agent rather than any monetary policy consideration. The Helios series was among several themed sets produced in this format during that period.

At 0.5 grams, the coin contains roughly a sixtieth of a troy ounce — a denomination with no practical circulation function.