10 Dollars - Charles III World's Purest Bullion

Five-nines gold — .99999 fineness — is a commercial rarity. Refining gold to that purity requires additional processing steps beyond the .9999 standard used by most sovereign mints, and only a handful of facilities worldwide can produce it consistently. The Royal Canadian Mint pioneered the specification for bullion coinage in 2007 with its one-million-dollar Maple Leaf.

Solomon Islands functions here as a licensing jurisdiction; the actual production and distribution run through private minting arrangements, a common structure for low-weight collector bullion issued under Pacific island authority.