Identification guide · Semi-Precious Stones
How to Identify Garnet
Garnet is usually red, orange, and green with a vitreous luster and is transparent. It has a Mohs hardness of 7. It scratches glass and a steel knife and cannot be scratched by a steel file. Its streak is white. It is most often confused with Spessartine, Grossular, and Hessonite; the tests below separate them.
Garnet identification checklist
| Color | Red, Orange, Green, Purple, Brown | Look at a clean, dry surface in daylight. Color zoning, banding or spots are as diagnostic as the hue. |
|---|---|---|
| Luster | Vitreous | Fresh surfaces shine like glass; a dull surface usually means weathering, so chip or wet a corner. |
| Transparency | Transparent | Hold a thin edge up to a bright light and note whether light passes through. |
| Mohs hardness | 7 | It scratches glass and a steel knife and cannot be scratched by a steel file. |
| Streak | White | Drag a corner across unglazed porcelain (the back of a bathroom tile) and check the powder color. |
| Cleavage | None | |
| Fracture | Conchoidal | Broken surfaces show smooth, curved, shell-like scoops. |
| Specific gravity | 3.8 | Heavier than it looks (specific gravity about 3.8). |
| Crystal system | Cubic |
Extra tests for Garnet
Glass check. Garnet shares a glassy luster and conchoidal fracture with man-made glass. Glass sits near Mohs 5.5 and often contains round gas bubbles, so a hardness test and a hand lens separate them.
Garnet look-alikes and how to tell them apart
Both sit near Mohs 7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Garnet vs Spessartine →
Both sit near Mohs 7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Garnet vs Grossular →
Both sit near Mohs 7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Garnet vs Hessonite →
Both sit near Mohs 7, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Garnet vs Pyrope →
Is my Garnet real?
- Hardness: real Garnet sits at Mohs 7. Glass imitations are about 5.5, so genuine Garnet scratches glass while a glass fake cannot.
- Bubbles: round gas bubbles under a 10x loupe mean glass or resin, never a natural stone.
- Color: dyed material concentrates color in cracks and pores; look for pigment collecting at the edges of fractures.
- Temperature: natural crystals feel cool and take longer to warm in your hand than plastic or resin.
Field tips
- Check whether the specimen's color and texture match typical Garnet examples.
- Use hardness, streak, luster, grain size, and locality together; no single trait is enough for every specimen.
Garnet identification FAQ
How can you tell if a rock is Garnet?
Check the color (red, orange, green, and purple), the vitreous luster, a Mohs hardness of 7 and a white streak. Photographing it with the StoneSnap app gives a match in seconds.
What is the hardness of Garnet?
Garnet has a Mohs hardness of 7. It scratches glass and a steel knife and cannot be scratched by a steel file.
What is the difference between Garnet and Spessartine?
Garnet (Mohs 7, vitreous luster) and Spessartine (Mohs 7, vitreous luster) look alike, but hardness, streak and heft usually separate them. See the full Garnet vs Spessartine comparison for a side-by-side table.
How do I know if my Garnet is real?
Real Garnet matches the hardness listed above, shows no round gas bubbles under magnification, and does not concentrate dye in cracks. Glass and resin fakes fail at least one of those checks.
Is Garnet worth anything?
Entry-level Garnet specimens sell for around $10, typical collector pieces about $100, and premium examples $3000 or more depending on size, quality and locality.
What color is Garnet?
Garnet is most often red, orange, green, and purple. Color varies with impurities and locality, so confirm with hardness and luster rather than color alone.
