June 13, 2018 Is This the Modern Mood Ring? A Rundown of the Coolest Color Changing Gems Essential info about color-changing sapphires, diamonds and alexandrite.

As the ring wearer's body temperature changes, so, too, does the mood ring's crystal change. This retro jewelry choice is enjoying a comeback — here's what to know about this nostalgic item.

Remember the 1990s, when mood rings were having a moment? Well, what’s old is new again, except with a high-tech twist: Instead of color-changing stones to indicate shifting emotions, today’s “modern ...