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Mood Rings contain thermotropic liquid crystals inside the stone or the band of the mood ring. These liquid crystals are able to show different colors at different temperatures. The liquid crystals in modern mood jewelry are usually made from a flat strip of liquid crystals with a protective coating.
Quick Answer. The ever-changing colors of a mood ring represent the wearer's mood at any given moment. For instance, blue represents a feeling of calm, and black represents severe stress and tension. Mood rings are designed with liquid crystal that changes color when the body temperature is raised or lowered, similar to a liquid crystal thermometer.