The most valuable gold is 24K gold because 24K gold contains 99.9% of pure gold. How do you find out how much pure gold your jewelry contains? 10K gold: 10 divided by 24 equals 41.6% pure gold – price per pennyweight for 10k gold: $37.92 14K gold: 14 divided by 24 equals 58.3% pure gold – price per pennyweight for 14k gold: $53.33 WoDAf.