What do the colors mean on a mood ring?
Depending on the ring the colors can have different meanings. Black is thought to be negative in most cases, red is associated with anger, green with growth, etc. You can actually view color charts online to see what all the colors mean. For more information see here: http://www.healthynewage.com/mood-ring-color-chart.
Your state of mind and mood changes your body temperature, which causes your mood ring to change color: Black=tense/nervous, White=frustrated, Green=active/relaxed, Blue-Green=relaxed/inner emotions charged, Blue=relaxed/lovable, Dark Blue=happy/passionate, Red=excitement/energy, Yellow=imaginative, Orange=wanting things, Brown=jittery/restless