Are there any other gemstones which change color?

1. Are there any other gemstones which change color?  /by  Angelica  at Apr 4 2009,2:04 PM/
How do alexandrite and color change garnet differ in appearance?
2. Alexandrite Garnet  /by  Michael Vanevski  at Apr 4 2009,2:04 PM/
Color change Garnet is a mix of spessartite and pyrope garnet from Africa
3. Color change garnet vs Alexandrite  /by  David Weinberg  at Apr 5 2009,12:04 AM/
Color change garnets are notable for their color change throughout the day as a function of their sensitivity to the different color temperatures