Almandine
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The most common and widespread garnet species, almandine owes its deep red to reddish-brown color to iron and aluminum within its isometric crystal structure. It grows in metamorphic rocks such as schist and gneiss, with gem-quality material drawn from India, Sri Lanka, Brazil, and the United States. A Mohs hardness of 7.0 to 7.5 gives it good wearability, and its velvety red long made it one of the most popular and affordable red stones, historically substituted for costlier ruby. Moderately priced among the semi-precious gems, almandine belongs to the garnet family and so serves as a January birthstone.
Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
7.0 – 7.5
Specific Gravity
3.95 – 4.3
Refractive Index
1.77 – 1.82
Crystal System
Isometric
Luster
Vitreous
Cleavage
Indistinct
Fracture
Conchoidal
Color
various
Dispersion
0.027
Pleochroism
Absent
Mohs Hardness
| Mohs | Reference mineral | Almandine |
|---|---|---|
| 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 Almandine
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.
Cultural Significance
Birthstone Month
1 (traditional)
About Almandine
アルマンディンは最も一般的で産出量の多いガーネット種で、鉄とアルミニウムによって生じる深紅から赤褐色の色合いが特徴です。インド・ブラジル・マダガスカル・スリランカなど世界各地で産出し、古代から装身具に使われてきた歴史を持ちます。宝石学的には6面体での劈開がないため研磨が容易で、カボションやファセットカットに適しています。
On this page
Jewelry Use
Durability
7/10
Suitable for daily wear
Science FYI Family
Frequently Asked Questions
What is Almandine?
アルマンディンは最も一般的で産出量の多いガーネット種で、鉄とアルミニウムによって生じる深紅から赤褐色の色合いが特徴です。インド・ブラジル・マダガスカル・スリランカなど世界各地で産出し、古代から装身具に使われてきた歴史を持ちます。宝石学的には6面体での劈開がないため研磨が容易で、カボションやファセットカットに適しています。
What is the hardness of Almandine?
Almandine has a Mohs hardness of 7.0 to 7.5, making it excellent for use in jewelry.
What color is Almandine?
Almandine is primarily Various.
How much does Almandine cost?
Almandine falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
Is Almandine a birthstone?
Yes, Almandine is the January birthstone (traditional).