10 Dollars - Charles III Colosseum

At 0.155 grams, this sits among the smallest gold coins commercially produced anywhere — a format pioneered largely by the Perth Mint and subsequently adopted by several Commonwealth issuers chasing the entry-level bullion market. Solomon Islands has no domestic gold refining capacity and issues no coins through a national mint; this piece was almost certainly produced under license by a private minting house, with the island nation's name lending legal tender status to a product manufactured entirely elsewhere.