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 hardness of Almandine shown against the ten reference minerals, from talc (1) to diamond (10).

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

A almandina é a variedade de granada mais comum e amplamente distribuída, caracterizada pela sua cor vermelho-profunda com tonalidades acastanhadas ou violáceas. Composta por silicato de ferro e alumínio, forma-se em rochas metamórficas como xistos e gnaisses. O nome deriva da antiga cidade de Alabanda, na Ásia Menor, conhecida como centro de comércio destas pedras. Utilizada em joalharia desde os tempos medievais, a almandina era muito apreciada na época vitoriana. Os melhores exemplares apresentam uma cor vermelha intensa com boa transparência e são utilizados em anéis, colares e brincos.