Colour change GemStones

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