20 Dollars - Charles III Moon phases

The Moon Phases series from the Royal Canadian Mint uses selective black rhodium plating to create the darkened sky field — a technically demanding process that requires precise masking during the plating stage to preserve the polished relief of the lunar surface itself. Rhodium, a platinum-group metal, is applied in extremely thin deposits measured in microns; too heavy a coat obscures fine detail, too light and the contrast fails entirely.

KM#3593–3599 spans seven coins, each capturing a distinct lunar phase across the synodic cycle. The series was issued under Charles III's effigy following his accession after Elizabeth II's death in September 2022 — his first appearance on Canadian collector coinage of this type.