5 Dollars - Charles III Black Mark

Niue's licensing arrangements with the New Zealand Mint have made the island one of the most prolific third-party bullion and numismatic issuers in the Pacific, despite having a population under 2,000. The program generates revenue for a territory that relies heavily on New Zealand subsidies and remittances from its diaspora — which outnumbers residents on the island by roughly twenty to one.

The black diamond inclusion places this among a narrow category of certified gemstone-set coins where the stone's value is largely nominal; industrial-grade black diamonds are among the least expensive cut gemstones commercially available.