“Emerald by day, ruby by night,” Alexandrite is well known for displaying one of the most remarkable colour changes in the gem world — green in sunlight and red in incandescent light. This variety of gem-quality chrysoberyl makes an excellent jewellery stone (if you can acquire one).
Alexandrite was discovered in the Ural Mountains of Russia in the 1830s. In 1834, Count Lev Alekseevich Perovskii named the stone in honour of the then-future Czar of Russia, Alexander II. In the 19th and early 20th centuries, the Czars were widely considered the standard for royal pomp. A combination of beauty, celebrity, and rarity helped create a mystique around this gem in the public imagination.