Gemstone profile and identification guide
Hessonite
Hessonite is the orange to brownish-orange variety of grossular garnet.
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Overview
Hessonite is the orange to brownish-orange variety of grossular garnet.
Did you know? Hessonite may show a roiled appearance sometimes called treacle effect in some stones.
Use this profile as a collector reference and educational guide for quick on-page comparison, then validate with the interactive identification system.
Identification
Name: Hessonite
Scientific classification: Silicate (Garnet Group: Grossular Variety)
Hardness: 7 Mohs
Transparency: transparent
Lustre: vitreous
Crystal system: Isometric (Cubic)
Primary colour: Honey Orange
Secondary colour: Brownish Orange
Colour family: Oranges & Yellows
Grossular garnet RI/SG values and characteristic warm honey colour distinguish hessonite.
Verification Status
Status: verified-core-fields
Reference priority: GIA, Gem-A, Mindat, International Gem Society
Core identity, locality, and physical-property fields reviewed against standard gemological references.
Values are reported as practical gemological ranges where appropriate.
Physical Properties
Hardness category: hard
Hardness value: 7 Mohs
Chemical composition: Calcium aluminum silicate [Ca3Al2(SiO4)3]
Crystal system: Isometric (Cubic)
Common locations: Sri Lanka, India, Tanzania, Madagascar, Brazil
Learn more: Gem-A gemstone education resources.
Colour Variations
Grossular garnet variety in honey-yellow to orange-brown tones.
Optical effects: None specified in the current dataset.
Detailed Gemology
Mineral species: Grossular garnet (hessonite variety)
Mineral group: Garnet group
Chemical formula: Calcium aluminum silicate [Ca3Al2(SiO4)3]
Mohs hardness: 7
Crystal system: Isometric (Cubic)
Lustre: vitreous
Transparency: transparent
Streak: White
Cleavage: None
Fracture: Conchoidal to uneven
Specific gravity: 3.57-3.73
Refractive index: 1.732-1.759
Optical phenomena: Treacle-like internal appearance in some stones
Colour range: Honey yellow to orange-brown and red-brown
Common inclusions: Crystals, roiled textures, fingerprints
Geological environment: Metamorphic and skarn calc-silicate environments
Principal mining regions: Sri Lanka, India, Tanzania, Madagascar, Brazil
Important commercial sources: Commercial hessonite is sourced chiefly from Sri Lanka and India, with additional East African production
Historical significance: Long-used garnet variety in South Asian jewellery traditions.
Common treatments: Generally untreated.
Synthetic or imitation forms: Glass and synthetic garnet look-alikes exist.
Common look-alikes: Spessartine, zircon, citrine
Jewellery uses: Used in faceted jewellery and collector stones.
Care recommendations: Generally suitable for jewellery; avoid hard impacts and abrasive wear.
Cross-check profile data with GIA Gem Encyclopedia and Mindat entry for Hessonite.
Formation
Forms in metamorphic and skarn-related calcium-rich environments.
Origin
Commercial hessonite is sourced chiefly from Sri Lanka and India, with additional East African production
Uses
Best for: Used in faceted jewellery and collector stones.
Ideal uses: Faceted rings, pendants, and collector cuts with warm body colour.
Care
Generally suitable for jewellery; avoid hard impacts and abrasive wear.
Need another candidate? Use advanced gemstone search or return to the identification guide.
Related gemstones by colour
Related gemstones by hardness
Gemstones from the same mineral family
Commonly confused gemstones
Hessonite FAQ
How can I identify Hessonite?
Compare hardness (7 Mohs), crystal system (Isometric (Cubic)), colour profile, and lustre (vitreous) with your sample. Then cross-check related gemstones listed above.
What colour range does Hessonite appear in?
Grossular garnet variety in honey-yellow to orange-brown tones.
Where is Hessonite commonly used?
Faceted rings, pendants, and collector cuts with warm body colour.. For maintenance, follow the care guidance in this profile.
Scientific References
GIA: general gemstone identity (reviewed) - Batch 02 factual verification pass.
Gem-A: gemological terminology and testing references (reviewed) - Batch 02 factual verification pass.
Mindat: mineral species and principal localities (reviewed) - Batch 02 factual verification pass.
International Gem Society: gem trade context and treatment overview (reviewed) - Batch 02 factual verification pass.