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 of Chrysoberyl shown against the ten reference minerals, from talc (1) to diamond (10).

Mohs	Reference mineral	Chrysoberyl
1	Talc
2	Gypsum
3	Calcite
4	Fluorite
5	Apatite
6	Orthoclase
7	Quartz
8	Topaz
9	Corundum
10	Diamond

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

O crisoberilo é um mineral de óxido de berílio e alumínio que engloba algumas das variedades gemológicas mais raras e valiosas do mundo. As suas três principais variedades são: o crisoberilo comum (amarelo-esverdeado a verde), o olho de gato (com chatoyância perfeita) e a alexandrite (com mudança de cor espectacular entre verde e vermelho). Os olhos de gato de crisoberilo são os mais valorizados de todos os efeitos de chatoyância, com os melhores exemplares provenientes do Sri Lanka. A alexandrite de qualidade é uma das gemas mais raras e valiosas de todo o mundo gemológico.