Heart Mood Ring with Adjustable Size Band

• $1.79
• 1 mg
• Xump.com

Mood rings were invented in 1967 by a man named Marvin Wernick, who saw a great idea for a toy when he saw one of his friends take a child's temperature by using a strip of thermotropic material. A mood ring is essentially a liquid thermometer that changes color according to the temperature on the wearer's skin. It is thought that this may indicate the mood of the wearer, as some claim that skin temperature fluctuates with the emotional state of the wearer.