A gold coins (gp) is by itself, a considerable amount of currency, and quite rare.
Most peasants and laborers typically do not even have 1gp to their name.
Those who tempt fate, like adventurers, who risk their life for the treasures of gold. Merchants, nobles, and trade houses, typically deal in gold coins due the quantity and type of goods they sell.
One gold coin could be a 1 to 2 weeks pay for an unskilled laborer.
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.
Its surface gleaming with intricate engravings. Heavy for its size, it fits snugly in your palm, cool and smooth, edges worn from countless trades.