50 Dollars - Charles III Heart Diamond

The "Ideal Cut" designation here isn't marketing — it's a specific grading standard requiring precise angular proportions to maximize light return through the table facet, originally codified by Marcel Tolkowsky in his 1919 treatise Diamond Design. Setting a stone to that standard inside a struck silver coin requires the bezel to be fabricated separately and press-fitted after striking, since no die process tolerates a loose diamond.

At 0.23 carats, the stone sits just above the threshold Canadian customs classify as a gemstone import rather than a raw material — a distinction that affects the coin's duty and valuation category.