In reality, absolutely nothing.
According to the advertising:
No not all mood ring colors are the same. The colors vary depending upon your mood. For example if the ring turns black it means you are afraid of something.
On a mood necklace or mood ring, turquoise or blue green generally means that you are somewhat relaxed.
its different for each mood ring so sometimes they come with a card or sheet with the colors meanings.
they vary. the colors are just light sensitive or heat sensitive
Each color change of the Mustache mood ring means something. The following list explains each of the colors, black means stressed, red means fearful, yellow means nervous, a light green ring means that you have mixed emotions, blue is relaxing, purple is calm, and dark green means romance.
on a mood ring, the colours symbolize what mood you are currently feeling. For example, if you have the mood ring on and the colour is blue, it means that you are feeling sad. Or if the mood ring is black, it means you are mad.
black means love blue means average red means energy & so on
A mood ring is a ring that shows your mood. It will show you colors like red, blue, orange,and green.By the touch of your skin it can tell you how you feel. That's why its called a Mood Ring.
No, for example...on one mood ring yellow means happy and blue means clam and purple means flirty, but on another ring, blue is happy, brown is flirty and purple is calm. :)
your emotion
well while there are multiple colors that mean happy, the most common one is green. :)
On my ex-wife's mood ring it was blue when she was happy. When she wasn't it left a big red welt on my forehead