This color change is seen best in thicker stones,. Alexandrite cat’s eye ia a great rarity. Care must be taken when working with it as it is sensitive to knocks, not resistant to alkalies, and the color changes under great heat.
The deposits in the Urals are worked out. Today is mainly mined in Sri Lanka and Rhodesia. The largest cut stone weighs 66ct and is in the Smithsonian Institution in Washington.

*Info by Walter Schumann “Gemstones of the World”