What’s the Difference Between Karat and Carat?

Carat and karat are two terms commonly confused in the jewelry industry, but they refer to very different aspects of fine jewelry. In a jewelry store setting, carat (ct) is a unit of weight used to measure diamonds, gemstones, and pearls. One carat equals 200 milligrams, and this measurement plays a major role in determining the value of diamond rings, engagement rings, and other luxury jewelry pieces. Larger carat weights typically increase a stone’s rarity and price, especially when combined with quality factors like cut, clarity, and color.

On the other hand, karat (K) refers to gold purity and is essential when buying or selling gold jewelry. Pure gold is 24 karat gold, meaning it contains 100% gold. However, most jewelry—such as gold chains, bracelets, and wedding bands—is made in 18K, 14K, or 10K gold. These lower karat options are mixed with other metals to improve durability, making them ideal for everyday wear while also influencing the jewelry’s color, such as yellow gold, white gold, or rose gold.

Understanding the difference between carat weight and gold karat purity is crucial when shopping at a jewelry store or working with a gold buyer. Whether you’re purchasing a diamond engagement ring, investing in fine gold jewelry, or looking to sell gold, knowing these terms helps you make confident, informed decisions and ensures you receive the best value.

At St. Louis Gold Buyers & Jewelry Center, our experienced jewelry professionals specialize in diamonds, gold buying, jewelry appraisal, and estate jewelry. We take pride in offering some of the highest payouts in St. Louis for gold, silver, and diamond jewelry. Visit our jewelry store today for expert guidance, honest evaluations, and answers to all your questions about carat vs. karat and how they impact the value of your jewelry.