How do mood rings supposedly work

Does the stone change color based on your mood? What makes it change color, does it’s color have anything to do with your own physiology like blood pressure, how hot/cold your hands are (which is affected by stress) or pulse or is it’s color unrelated to your own physiology?

It’s all about your skin temperature.

Mood Rings change color due to temperature changes.
Changes of mood may cause a bodiy temperature change that in turn will affect the ring color.

Well, indirectly. Mood changes affect circulation, which changes the temperature of the extremities. Body temperature stays pretty close to 98.6 unless you are ill or hypothermic.

I’ve read that 98.2 is closer to the actual mean for most people. Is this correct?

Mine is 99.1

Mine’s 99-something and generally dips down to 97 or lower when I’m sick.