Only held by rich nobles, houses, or trade guilds. Usually as a form of conversion upon massive wealth. Exchanges to gold 1:10.
Each coin weights about 1/3 of an ounce. Fifty coins always weigh a pound, no matter the type of coin. (Lore: this was set to standardize trade by merchants and guilds.)
The platinum coin gleams with a cold, unyielding luster, its surface etched in intricate filigree that catches light like frost on steel. Weighing a mere third of an ounce, it rests heavy in your palm, a symbol of vast fortunes condensed into unremarkable thinness. Fifty such discs balance precisely to a pound, their edges sharp enough to draw blood if gripped too fiercely.