There are many GemStones that can change colour, these are some of them :
* Colour change Purple to Red Star Sapphire
* Colour change Blue to Purple Star Sapphire
* Colour change Yellowish Green to Reddish Alexandrite Chrysoberyl
* 1.635 carats Colour change Blue to Purple Spinel Gemstone from Srilanka with dimensions
8.67 X 5.58 X 3.835 mm
