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Garnet (almandine) vs Moissanite

Moissanite is harder (Mohs 9.25) than Garnet (almandine) (Mohs 7–7.5), so it resists scratching better.

Moissanite has the higher refractive index (2.648–2.691 vs 1.790), which a refractometer (over-the-limit reading) can use to separate them.

Garnet (almandine) is denser (SG 4.05 vs 3.22); a garnet (almandine) of the same size weighs about 26% more.

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PropertyGarnet (almandine)Moissanite
Species / materialGarnetSilicon carbide
Mohs hardness7–7.59.25
Refractive index1.7902.648–2.691
Specific gravity4.053.22
Crystal systemCubicHexagonal
BirefringenceNone (isotropic)0.043

Values are typical ranges from standard gemmological references; individual stones can vary.

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