Corundum
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
9.0
Specific Gravity
3.9 – 4.05
Refractive Index
1.758 – 1.78
Crystal System
Trigonal
Luster
Adamantine,Vitreous
Cleavage
None
Fracture
Uneven,Conchoidal
Color
various
Birefringence
0.007
Dispersion
0.018
Pleochroism
Dichroism: blue - violet-blue and greenish-blue; green - yellowish-green; yellow - pale yellow; purple - violet; orange, yellowish-red - deep crimson.
Mohs Hardness
Mohs Hardness: 9.0
1 Soft10 Hard
Crystal System
Value & Market
Price Tier
Fine ($500-5,000/ct)
Where to Buy Corundum
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 Corundum
강옥(鋼玉, 코런덤)은 산화알루미늄(Al₂O₃) 광물로, 다이아몬드 다음으로 굳은 천연 광물(모스 경도 9)입니다. 적색 변종은 루비, 그 외 모든 색상의 변종은 사파이어라 불리며, 보석의 왕 루비와 함께 가장 귀하고 아름다운 보석 광물에 속합니다. 미얀마, 스리랑카, 태국, 카슈미르가 역사적으로 유명한 산지이며, 루비의 '비둘기 혈색(Pigeon's Blood)' 적색이 최고로 평가됩니다.
Jewelry Use
Durability
10/10
Suitable for daily wear
Science FYI Family
Frequently Asked Questions
What is Corundum?
강옥(鋼玉, 코런덤)은 산화알루미늄(Al₂O₃) 광물로, 다이아몬드 다음으로 굳은 천연 광물(모스 경도 9)입니다. 적색 변종은 루비, 그 외 모든 색상의 변종은 사파이어라 불리며, 보석의 왕 루비와 함께 가장 귀하고 아름다운 보석 광물에 속합니다. 미얀마, 스리랑카, 태국, 카슈미르가 역사적으로 유명한 산지이며, 루비의 '비둘기 혈색(Pigeon's Blood)' 적색이 최고로 평가됩니다.
What is the hardness of Corundum?
Corundum has a Mohs hardness of 9.0, making it excellent for use in jewelry.
What color is Corundum?
Corundum is primarily Various.
How much does Corundum cost?
Corundum 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 Corundum?
Corundum belongs to the Trigonal crystal system.