You've seen them. Maybe you have one. They're called Mood Rings and they change color, assumably according to the emotional state of the wearer. The theory is that the sets in these mood rings change due to your moods. Whether or not that is true, they are fun. Below are some generally accepted interpretations of what some common colors would represent. In other words, if you were wearing your mood ring and it turned yellow, it might indicate that your mood is imaginative or creative in some way. From a chakra point of view, yellow corresponds to the third chakra energies so perhaps it could also indicate a time when you are in some sort of ego, or personality self, struggle or a time when you are really busy putting on a particular mask for someone.