Turn a coin's physical weight and purity into a melt-value benchmark, then optionally add a market premium or discount to see a more realistic modeled value.
Two coins can weigh the same but contain different amounts of gold if their purity differs. Conversely, two coins with the same gold content can trade at different market prices because of mint, demand, scarcity or product premiums.
The melt value is the cleanest benchmark for contained metal. The optional market premium is a separate scenario and should be based on actual comparable market pricing rather than an assumed collectible premium.
Calculate fine-gold weight and multiply it by the gold price per gram.
Yes.
Yes, depending on the actual transaction price.