During a period when people started exploring their feelings, the mood ring was born. It spread throughout the US. The mood ring is one of those weird inventions that has a genius design. It contains temperature-sensitive liquid crystal encased in quartz. Whenever your body temperature changes, the ring picks it up. Each color on the ring corresponds to a different mood, hence the mood ring. We can’t imagine gauging your mood from a ring, but that’s what used to happen (Stu News Laguna).