Demantoid Garnet
Andradite Garnet (variety Demantoid)
What is Demantoid Garnet?
Demantoid garnet is a vibrant green gemstone prized for its brilliance and fire. It is a variety of andradite garnet, known for its high dispersion, which gives it a remarkable play of colors. Demantoid garnets are often found with distinctive horsetail inclusions, which are considered desirable by collectors.
Optical Properties
- Refractive Index
- 1.888 - 1.895
- Birefringence
- None
- Pleochroism
- None
- Optical Character
- Isotropic
- Dispersion
- 0.057
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Demantoid Garnet before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Demantoid Garnet Localities Map
See where Demantoid Garnet is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Green, yellowish-green, brownish-green
- Hardness (Mohs)
- 6.5 - 7
- Density
- 3.82 - 3.89 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- Ca3Fe2Si3O12
- Elements
- Calcium, Iron, Silicon, Oxygen
Also Known As
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Demantoid Garnet FAQs
How do I identify Demantoid Garnet?
Demantoid Garnet can be identified by its hardness of 6.5 - 7 on the Mohs scale, Green color. Look for these key characteristics when examining specimens.
What color is Demantoid Garnet?
Demantoid Garnet typically appears in Green, yellowish-green, brownish-green. Color can vary depending on impurities and formation conditions.
How hard is Demantoid Garnet?
Demantoid Garnet has a hardness of 6.5 - 7 on the Mohs scale. This gives it moderate hardness.