5 Dollars - Elizabeth II Diamond Wedding Anniversary

The Diamond Wedding Anniversary commemorates the 2007 milestone marking 60 years of marriage between Elizabeth II and Prince Philip — though by 2021, Philip had died in April of that year, making this a notably posthumous tribute to the union. Cook Islands has long maintained a prolific commemorative program precisely because its coinage generates revenue rather than circulates, and sub-gram gold issues like this one are squarely aimed at the collector bullion market rather than any monetary function.