There are several ways to distinguish between 14k and 18k gold: Karat Stamp: Look for a stamp that says "14k" or "18k" on the jewelry. Sometimes it might be stamped as "585" for 14k or "750" for 18k, representing the gold content (58.5% and 75% respectively). Color: 18k gold has a richer, more intense yellow color compared to 14k gold, which is slightly paler. Price: 18k gold is more expensive than 14k gold due to its higher gold content. Magnet Test: Neither should be magnetic, but 14k gold might be slightly more magnetic due to its higher content of other metals. Acid Test: A jeweler can perform an acid test, where a small amount of acid is applied to the gold. The reaction differs between 14k and 18k gold. Electronic Gold Tester: This device can accurately determine the karat of gold. Remember, the most reliable way to determine the karat of gold is to have it evaluated by a professional jeweler.