In 2012, 24 karat gold was priced at almost $1800 per ounce. In previous years, it almost reached $2000. A sample calculation. As a ballpark estimate, a gold crown may weigh on the order of one-tenth of an ounce. If its gold content runs somewhere between 10 and 18 karats, at even just $800 an ounce, it would be worth about $30 to $60.