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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.
Can a piece of jewelry, in this case a ring or pendant really tell you what mood you are in? I would think not, but some think it can. Either way they are fun to have and see if the color does change when your mood changes. Below is a chart to help you out. The colors won't be the exact same shade of color yours will be. Most mood rings that are made are costume jewelry but you can buy them made in sterling silver. They were created in 1975 by Josh Reynolds and Maris Ambats. They are not actually psychics, they are more like little heat gauges on your finger.