For bona fide gem connoisseurs, nothing compares to the hypnotic color change variety witnessed in the alexandrite stone. This rare and valuable jewel is actually a chrysoberyl that naturally changes color from daylight to candlelight. The striking and mysterious effect is infinitely repeatable. People routinely described this stone as an emerald by day and a ruby by night. The name Alexandrite (for Czar Alexander II) is a romantic nod to its original discovery in Russia’s Ural Mountains in 1830.
If that’s not enough of a light show for you, the stone occasionally produces a cat’s eye effect when cut en cabochon. Negative crystal inclusions and rutile silk account for its ability to create a cat’s eye phenomenon from a piece of alexandrite rough.