25 Dollars - Elizabeth II Panda

The Panda motif has been a fixture of Chinese numismatic issues since 1982, and third-party issuers have long produced gold tributes to the design — Solomon Islands among them — largely for the Chinese collector market rather than any domestic monetary purpose. These pieces are legal tender in name only; the face value bears no relationship to bullion content, and no one has ever spent one.

At 40 grams of .999 gold, the metal value alone dwarfs the nominal denomination by several orders of magnitude.