Chrysoberyl is derived from the Greek words Chrysos and Beryuos, meaning "golden emerald". Emeralds are rare minerals in their own right, and even rarer in the form of cat's eyes and color-changing effects, making them highly prized. The most famous of all chrysoberyls is the chrysoberyl cat's eye.
[Introduction to Chrysoberyl].
Chemical formula: BeAl2O4
Luster: Glassy
Transparency: transparent to opaque
Crystal system: rhombohedral
Fracture: shell fracture
Hardness: 8.5
Specific gravity: 3.72
Refractive index: 1.745-1.755
Birefringence: 0.008-0.010
Color: yellow, yellow-green, tawny
[Variety].
Emeralds are mainly divided into four categories according to their special optical effects:
With cat's eye effect is called cat's eye
Those with a color-changing effect are called Alexandrite
Those without special optical effects are called chrysoberyl.
Those with both color change and cat's eye effects are called alexandrite cat's eye
[Place of Origin]
Russia
The best alexandrite, i.e. the one with the best color-changing effect, is produced in the Urals.
Sri Lanka
Sri Lanka's alluvial mines produce large yellow-green variegated stones and high-quality cat's eye gems.
Brazil
Apart from Sri Lanka, the most important source of chrysoberyl is Brazil, where varieties of chrysoberyl are found, including transparent yellow and brown chrysoberyl, good cat's eye and high quality variegated stones.
[How to choose a golden emerald].
If it is an emerald with cat's eye effect, naturally the honey yellow color is more collectible;
② If it is a Alexandrite, it is blue or green under daylight, purple or red under incandescent light for the top grade;
③ and ordinary transparent emerald color evaluation is the more intense the more colorful the better.
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