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
铁铝榴石是石榴石族中最常见的品种，以其深沉的红色至红褐色著称。这种宝石在全球各地的变质岩中广泛分布，印度、巴西、斯里兰卡和美国均有重要产地。铁铝榴石折射率高、色彩浓郁，自古以来便是深受欢迎的宝石材料，古代工匠将其镶嵌于黄金饰品之中，称为"宝石红玉"。
On this page
Jewelry Use
Durability
7/10
Suitable for daily wear
Science FYI Family
Frequently Asked Questions
What is Almandine?
铁铝榴石是石榴石族中最常见的品种，以其深沉的红色至红褐色著称。这种宝石在全球各地的变质岩中广泛分布，印度、巴西、斯里兰卡和美国均有重要产地。铁铝榴石折射率高、色彩浓郁，自古以来便是深受欢迎的宝石材料，古代工匠将其镶嵌于黄金饰品之中，称为"宝石红玉"。
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).