Chrysoberyl

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A beryllium aluminum oxide, chrysoberyl is prized as much for its family of varieties as for the stone itself, encompassing alexandrite, the color-change form, and cat's-eye chrysoberyl, the finest of all chatoyant gems, alongside transparent yellow-green material. Its hardness of 8.5 on the Mohs scale makes it the third-hardest natural gem after diamond and corundum, lending it excellent durability. It crystallizes in the orthorhombic system, and major sources include Brazil, Sri Lanka, and East Africa. That combination of hardness with its phenomenal alexandrite and chatoyant forms gives this fine-tier semi-precious species considerable gemological importance.

Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 8,5

Specific Gravity 3,69 – 3,81

Refractive Index 1,746 – 1,763

Crystal System Orthorhombic

Cleavage Good

Fracture Uneven,Conchoidal

Color various

Birefringence 0,007

Dispersion 0,015

Pleochroism Yellow - weak: colorless - light yellow - yellow-(green); Green - weak: yellowish - olive-yellow - (colorless)

Mohs Hardness

Mohs Hardness: 8,5

1 Soft10 Hard

Crystal System

Value & Market

Price Tier Fine ($500-5,000/ct)

Where to Buy Chrysoberyl

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

Links may earn a commission at no extra cost to you.

About Chrysoberyl

El crisoberilo es un aluminato de berilio de extraordinaria dureza (8.5 en la escala de Mohs) y brillo, conocido por albergar tres de las variedades gemológicas más excepcionales del mundo: la alexandrita (con cambio de color), el ojo de gato (chatoyant) y el crisoberilo amarillo-verde ordinario. Los mejores cristales de ojo de gato, que muestran una línea de luz nítida que se mueve sobre el cabujón, provienen de Sri Lanka. La alexandrita fina de los Urales rusos es una de las gemas más valiosas del mundo. El crisoberilo amarillo-verde común, de menor renombre, es también una gema de gran calidad. Sus depósitos principales se encuentran en Brasil, Sri Lanka, Myanmar y Tanzania.