💍Faceted Natural Alexandrite Filigree Style Ring Sterling silver. 925 Size 6.5 Made in Jaja, Turkey Alexandrite is a rare, color-changing gemstone, specifically a variety of the mineral chrysoberyl. It is known for its ability to appear green in daylight and red under incandescent light. This color-changing effect, along with its rarity, makes it one of the most sought-after and valuable gemstones in the world.