The purity of gold in a bracelet is measured in karats, with 24K being pure gold. However, pure gold is soft and prone to scratching, so it is often alloyed with other metals like copper or silver to enhance its strength. Common variations include 18K, 14K, and 10K gold, each offering a different balance of purity and durability. White gold, rose gold, and yellow gold are popular variations, achieved by mixing gold with specific alloys. This variety in gold types allows wearers to choose a bracelet that best matches their personal style and needs.