We buy that as well! Platinum and Gold are valued by its purity and weight. Pure gold is known as 24k gold but most jewelry is made from 18k, 14k and 10k. Simply put 24-karat gold is fine (99.9% pure), 18-karat gold is 75% gold, and 12-karat gold is 50% gold, with the other percentage being an alloy to give greater strength. We pay market value for platinum and gold minus refining fees.