Emotional Ring: A ring can change color by body temperature.The color includes black,yellow,red,green,blue,bluepowder,purple and other colors.<br> When you are in high emotions,the skin usually turn red.which causes capillaries to approach the skin surface and release heat.<br> When you feel uneasy or melancholy that will slightly change the surface temperature.The skin may be some wet and cold.<br> This physical response to the emotional state,which causes the capillaries to move the depths of the skin, lowering the body surface temperature.<br> Representative mood:<br> Black - painful<br> Orange - tense<br> Red - worries<br> Yellow - anxious<br> Green - curious<br> Blue - calm<br> Purple - Romantic<br>