Alexandrite is a fascinating gemstone, known for a unique phenomenon: its color changes depending on the light. Here's a detailed overview:
🔮 Origin of the name
It was discovered in 1830 in Russia (in the Ural Mountains) and named in honor of Tsarevich Alexander II. Its rarity and beauty quickly made it a highly prized gemstone.
🎨 Color change
What makes alexandrite famous is its ability to change color:
Natural light (sunlight or daylight) : green to bluish-green.
Artificial light (incandescent lamp) : red, violet or purple.
This phenomenon is due to the crystalline structure of the stone and the way it absorbs light at different wavelengths.
🧪 Chemical composition
Formula: BeAl₂O₄ (it is a variety of chrysoberyl).
Chromium is the element responsible for the color change.
💎 Physical characteristics
Hardness : 8.5 on the Mohs scale (very hard, just after sapphire).
Refractive index : high, it can shine intensely.
Birefringence : low.
Cleavage : absent, which makes it shock-resistant.
🌍 Deposits
Besides Russia, alexandrite is found in:
Brazil
Sri Lanka
Madagascar
Tanzania
India
Russian alexandrites are generally considered the most valuable because of the vividness of their color change.
💰 Value
Natural alexandrite, especially with strong color contrast and high purity, is extremely rare and expensive .
Synthetic versions exist and are much more affordable, but they do not have the same value.
🧘 Symbolism and beliefs
Stone of transformation and emotional balance .
Associated with luck , prosperity , and lasting love .
Alternative birthstone for the month of June (along with pearl and moonstone).
