:D Can you tell me all about mood rings?:D

Here you go (http://en.wikipedia.org/wiki/Mood_ring)

Dumb

Mood rings are extraordinary rings where the color of the stone changes depending on the emotional state of the wearer.

The color of stone indicate the mood of the wearer:

violet blue - glad, romantic
Blue - serene, stress-free
Green - average, not much going on with you
Yellow/amber - stressed, energized
Brown/gray - anxious, restless
Black - cold temperature or damaged ring