25 Dollars - Elizabeth II Princess Diana

Diana's death in August 1997 triggered an unprecedented crisis for the British monarchy, with Buckingham Palace's initial silence drawing sharp public condemnation. The commemorative coin market responded almost immediately and has never really stopped — Cook Islands has issued Diana-related silver pieces across multiple decades, leveraging its long-standing relationship with the New Zealand currency system and its willingness to produce high-denomination collector issues that no metropolitan mint would bother with.

At 155.53 g, this is a five-troy-ounce piece — a format almost exclusively aimed at the collector and bullion-adjacent market, never intended for any transactional use in the Cook Islands.