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 | 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
クリソベリルはアレキサンドライト（劇的な変色効果）・キャッツアイ（光沢のある光帯）・普通クリソベリル（黄緑色）の三つの優れた変種を含むベリリウムアルミニウム酸化物宝石鉱物族です。スリランカ・ブラジル・ミャンマーが主要産地で、モース硬度8.5の高い硬度を持ちます。アレキサンドライトとキャッツアイは宝石の中でも最も希少かつ価値の高い石の一つです。
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Jewelry Use
Durability
9/10
Suitable for daily wear
Science FYI Family
Frequently Asked Questions
What is Chrysoberyl?
クリソベリルはアレキサンドライト（劇的な変色効果）・キャッツアイ（光沢のある光帯）・普通クリソベリル（黄緑色）の三つの優れた変種を含むベリリウムアルミニウム酸化物宝石鉱物族です。スリランカ・ブラジル・ミャンマーが主要産地で、モース硬度8.5の高い硬度を持ちます。アレキサンドライトとキャッツアイは宝石の中でも最も希少かつ価値の高い石の一つです。
What is the hardness of Chrysoberyl?
Chrysoberyl has a Mohs hardness of 8.5, making it excellent for use in jewelry.
What color is Chrysoberyl?
Chrysoberyl is primarily Various.
How much does Chrysoberyl cost?
Chrysoberyl falls into the Fine ($500-5,000/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Chrysoberyl?
Chrysoberyl belongs to the Orthorhombic crystal system.