The best karat gold for a necklace depends on a variety of factors, including personal preference, budget, and durability. Generally, 14K and 18K gold are the most popular choices for necklaces. 14K gold is 58.3% pure gold mixed with other metals, making it a more durable option. It is also more affordable than 18K gold, which is 75% pure gold and therefore softer and more prone to scratching or bending. However, 18K gold has a richer, deeper color and is generally considered more luxurious. Learn more in our High Karat Gold Guide.