Mirage beads are color-changing beads that amaze folks once they realize that they are like mood rings of the past! When the beads are cold, they are black, but as heat is added they transform into beautiful green/blue hues. They come with a card that states: "Mirage beads come alive with fantastic colors as you wear them. Inspired by the mood jewelry of the 60's and 70's , these thermo-sensitive liquid crystal beads change color with minute variations in temperature. As with life itself, mirage beads are always changing and mysterious."