and it is said to be based on the weight of a one-time English penny. You can use a table to convert pennyweight into more familiar systems like ounces or grams, or
As a quick conversion guide, 1 pennyweight is equal to1.56 grams,0.05 troy ounces, and0.055 ounces. So, to convert the weight of your gold from grams to pennyweights, divide by 1.56 (or multiply by 0.64). How to Value the Pure Gold in Your Jewelry After you’ve calculated the weight ...