How much can i get for gold nugget that weighs 3.9grams?

The current market price for gold is around $1,400 per ounce. That is referred to as the "spot" price. There are 28 standard grams per ounce and 32 Troy ounces. If you base the calculation on standard ounces, then the spot value is approximately $200. However, most individuals cannot get spot price from dealers. Most dealers pay a percentage of the day's spot price. Selling the individual nugget can get more than spot due to their collectible value.