To spot a real Cuban link chain from a fake, start by examining the weight—authentic chains made from solid gold or silver are noticeably heavier than fakes made with cheap metals or plating. Check the links closely; real Cuban links have uniform, tightly connected, and well-polished links, while fakes may show uneven gaps or poor craftsmanship. Look for a hallmark or stamp indicating the metal's purity, such as “10K,” “14K,” “18K,” or “.925” for sterling silver. Use a magnet—real gold and silver are not magnetic. Also, inspect the clasp, which should be sturdy and blend seamlessly with the design. When in doubt, get the piece tested by a jeweler to confirm authenticity.