里面的戒指导热从你的手指到液晶的“石头”。The color green, which signifies "average" on the mood ring color scale, is calibrated to a typical wearer's body temperature, approximately 82 degrees Fahrenheit (28 degrees Celsius). If your surface temperature varies far enough from the norm, then the liquid crystals in the stone alter enough to cause a change in the color reflected. And if you take a mood ring off, it will normally change to black unless the ambient temperature is very high.