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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.
Black: If the mood ring is depicting black color, it is an indication of negative emotions in the person who is wearing it. Black stands for fear or depression or stress or anger. Yellow: Yellow is the color which states pleasant but not overly happy emotion. It can also state a cautious or anxious behavior in the person wearing that ring or the person is anticipating something.