Garnet Group

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Encompassing more than twenty silicate minerals that share a crystal structure but differ in chemistry, the garnet group produces an exceptional spectrum of colors, from red, orange, yellow, and green to purple, pink, colorless, and rare color-change varieties. Major gem species include pyrope, almandine, spessartine, grossular, andradite, and uvarovite, drawn from metamorphic and igneous rocks on every continent, including Sri Lanka. The group crystallizes in the isometric system and measures 6.5 to 7.5 on the Mohs scale. Among the most historically important gems, moderately priced and semi-precious as a family, garnets were traded and worn in ancient Egypt, Greece, and Rome, and garnet is the birthstone for January.

Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 6,5 – 7,5

Specific Gravity 3,55 – 4,33

Refractive Index 1,73 – 1,895

Crystal System Isometric

Luster Subadamantine,Vitreous

Cleavage None

Fracture Conchoidal

Color red

Dispersion 0,022

Mohs Hardness

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

Mohs	Reference mineral	Garnet Group
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 Garnet Group

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 (modern)

About Garnet Group

O grupo dos granatos compreende uma família diversificada de silicatos com estrutura cristalina semelhante, abrangendo espécies como a piropo, almandina, espessartina, grossulária, andradita e uvarovite. Ocorrem em praticamente todas as cores, com as variedades vermelhas a serem as mais tradicionais. Os granatos especiais incluem o demantóide (verde brilhante), a tsavorite (verde intenso) e a malaia. São encontrados em rochas metamórficas, ígneas e sedimentares em todo o mundo, tornando-os gemas amplamente disponíveis e versáteis.