Thermochromic Ring(Black, Gold, Silver)

Thermochromic Ring also called Heat activated ring or Temperature sensitive ring is a type of smart jewelry that changes color in response to changes in body temperature.

A person’s normal body temperature is 98.6°F (37°C).  When you are stressed or cold blood is directed to the internal organs and away from the skin and the mood ring will turn a darker color. If you are happier or feeling passionate the crystal will twist in another direction and start to change color as your body temperature increases.  Therefore there is a correlation with mood and your body temperature so to some degree a mood ring can show your emotion.