Alexandrite was first discovered in Russia ... The price on that thing is up to the imagination. One of the most expensive alexandrites that was actually sold is an unmounted, 21.41-carat stone ...

Alexandrite was first discovered in Russia and named for ... The 18.04-carat Rockefeller Emerald was the most expensive emerald per carat ever sold — at $5.51 million, or $305,500 per carat.

Alexandrite’s rarity and mesmerising optical properties ... the pink and padparadscha varieties (a delicate mix of pink and orange) are among the most expensive, fetching up to $20,000 per carat.

Because of its scarcity, especially in larger sizes, alexandrite is a relatively expensive member of the chrysoberyl family. It shares its status as a June birthstone with cultured pearl and moonstone ...