Sardonyx
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
6.5 – 7.0
Specific Gravity
2.55 – 2.7
Refractive Index
1.53 – 1.543
Crystal System
Trigonal
Luster
Waxy
Color
black
Birefringence
0.008
Mohs Hardness
| Mohs | Reference mineral | Sardonyx |
|---|---|---|
| 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
Moderate ($50-500/ct)
Where to Buy Sardonyx
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 Sardonyx
サードニクスはサード（赤褐色）と白色オニキスの縞模様が交互に重なった玉髄で、古来からカメオ彫刻に適した石として珍重されています。古代ローマ人はこれを身につけると勇気と雄弁さが増すと信じており、ギリシャ・ローマ・ルネサンス時代を通じてカメオ、印章、装身具に広く用いられました。現在の主要産地はブラジルとインドです。
On this page
Jewelry Use
Durability
6/10
Science FYI Family
Frequently Asked Questions
What is Sardonyx?
サードニクスはサード（赤褐色）と白色オニキスの縞模様が交互に重なった玉髄で、古来からカメオ彫刻に適した石として珍重されています。古代ローマ人はこれを身につけると勇気と雄弁さが増すと信じており、ギリシャ・ローマ・ルネサンス時代を通じてカメオ、印章、装身具に広く用いられました。現在の主要産地はブラジルとインドです。
What is the hardness of Sardonyx?
Sardonyx has a Mohs hardness of 6.5 to 7.0, making it moderate for use in jewelry.
What color is Sardonyx?
Sardonyx is primarily Black.
How much does Sardonyx cost?
Sardonyx falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Sardonyx?
Sardonyx belongs to the Trigonal crystal system.