# Alexandrite > [!material-gem] Material Details > | | | > |---|---| > | **Aliases/Varieties** | Chrysoberyl (color-change variety) | > | **Category** | Gemstone | > | **Color(s)** | Bluish green to green in daylight; red to purplish red in incandescent light | > | **Cost** | —— | > | **Environment/Habitat** | —— | > | **Profession(s)** | [[Jewelcrafter]], [[Tinkerer]] | > | **Qualities** | —— | > | **Rarity** | —— | > | **Size** | —— | > | **Weight** | —— | > [!material-gem] Specifications > | | | > |---|---| > | **Crystal System** | —— | > | **Formations** | —— | > | **Formula** | —— | > | **Hardness** | 8.5 (Mohs) | > | **Mineral Class** | Chrysoberyl | > | **Primary Components** | —— | > | **Refractive Index** | 1.746–1.755 | --- ## Description Alexandrite is an exceptionally rare, color-changing variety of the mineral chrysoberyl. Its defining trait is a dramatic shift in hue depending on the light source: green to bluish green in daylight, and red to purplish red under incandescent light, caused by a narrow absorption band in the stone. This fine material is now also found in various regions of the world, though large, high-quality stones remain scarce and command high value. Rare specimens can also display a cat's-eye effect alongside the color change. Alexandrite is a traditional gem of 55th wedding anniversaries. --- ## Occurrence —— ### Extraction & Preparation —— --- ## Properties ### Decorative Properties —— ### Industrial Properties —— ### Magical Properties —— ### Medicinal Properties ——