Karat (k) is used for gold, carat (c) for gemstones.24k indicates pure gold, 100% gold percent by weight. 18k indicates 18 karat gold, or by weight 18 parts gold to 6 parts other metals, or 75% pure gold.14k indicates 14 karat gold, or by weight 14 parts gold to 10 parts other metals, or 58.33% … Read more