Alexandrite
Tsarstone collectors guide
"Beauty, durability and rarity; such are the three cardinal virtues of a perfect gemstone. Stones lacking any of them cannot aspire to high place in the ranks of the precious stones..." G.F. Herbert Smith (1872 - 1953)
Although the color change is not strong, the clarity and tranparencey are quite good and the dark minty green color is especially attractive in daylight.
