Color-changing Alexandrite is nature’s magic trick, and one of the birthstones for June. Alexandrite is a very rare color-change variety of the mineral chrysoberyl. Originally discovered in Russia’s Ural Mountains in the 1830s, it’s now found in Sri Lanka, East Africa, and Brazil, but fine material with a strong color change is exceptionally rare and valuable. Alexandrite is named after Czar Alexander II of Russia, and has a bluish-green color in daylight and fluorescent light, but shifts to a r

Alexandrite is the rarest gemstone... - Gold & Diamond Source

Alexandrite, with its chameleon-like qualities, is a rare variety of the mineral chrysoberyl. Its color can be a lovely green in daylight or fluorescent light, changing to brownish or purplish red in the incandescent light from a lamp or candle flame. This is a result of the complex way the mineral absorbs light. | World Gemological Institute

Ammolite named the official gemstone of Alberta