Silver coins (sp) are the lifeblood of civilization's currency for trade.
Much more common (by a factor of 10:1 to 16:1) than gold, silver is mined in the crust of the earth, melted, weighed, then struck.
The conversion to gold coin is simply 10:1.
A day's worth of unskilled labor usually costs 1 to 2 sp a day.
A more skilled laborer could charge up to 2gp (a scribe who can read and write).
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.
Silver coins are larger than Gold Coins due to their density.
A silver coin gleams in your palm, its edges worn smooth, intricate runes etched deep into its surface, faintly glowing with a cool, metallic sheen under moonlight, heavy with an ancient, humming power.