color-changing stone
nounUK /ˈkʌlə ˈtʃeɪndʒɪŋ stəʊn/
US /ˈkʌlər ˈtʃeɪndʒɪŋ stoʊn/
A color-changing stone is a rock that looks like it changes color when light or heat hits it.
She held the color-changing stone up to the sun and watched it turn from gray to pink.
RELATED WORDS
OTHER MEANINGS
2. A novelty ring or jewelry stone that shifts hue with body temperature.
The color-changing stone in his ring turned bright green when he stepped outside.
3. A toy or decorative pebble that reacts to sunlight by darkening or brightening.
The garden path was lined with color-changing stones that glowed at dusk.
4. A mineral specimen whose apparent color varies with the viewing angle.
Collectors prize the color-changing stone for its shifting blue-green sheen.