Identification guide · Precious Stones
How to Identify Sapphire
Sapphire is usually blue, pink, and yellow with a adamantine luster and is transparent. It has a Mohs hardness of 9. It scratches glass, steel and even quartz; only harder gems will mark it. Its streak is white. It is most often confused with Spinel, Zircon, and Diamond; the tests below separate them.
Sapphire identification checklist
| Color | Blue, Pink, Yellow, Orange, Green, White | Look at a clean, dry surface in daylight. Color zoning, banding or spots are as diagnostic as the hue. |
|---|---|---|
| Luster | Adamantine | 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 | 9 | It scratches glass, steel and even quartz; only harder gems will mark it. |
| 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 | 4 | Heavier than it looks (specific gravity about 4). |
| Crystal system | Trigonal |
Sapphire look-alikes and how to tell them apart
Sapphire is harder (Mohs 9) than Spinel (Mohs 8), so Sapphire will scratch Spinel and not the other way round. It scratches glass, steel and even quartz; only harder gems will mark it. Sapphire vs Spinel →
Sapphire is harder (Mohs 9) than Zircon (Mohs 7.5), so Sapphire will scratch Zircon and not the other way round. It scratches glass, steel and even quartz; only harder gems will mark it. Sapphire vs Zircon →
Diamond is harder (Mohs 10) than Sapphire (Mohs 9), so Diamond will scratch Sapphire and not the other way round. It scratches glass, steel and even quartz; only harder gems will mark it. Sapphire vs Diamond →
Both sit near Mohs 9, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Sapphire vs Ruby →
Is my Sapphire real?
- Hardness: real Sapphire sits at Mohs 9. Glass imitations are about 5.5, so genuine Sapphire 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 Sapphire examples.
- Use hardness, streak, luster, grain size, and locality together; no single trait is enough for every specimen.
Sapphire identification FAQ
How can you tell if a rock is Sapphire?
Check the color (blue, pink, yellow, and orange), the adamantine luster, a Mohs hardness of 9 and a white streak. Photographing it with the StoneSnap app gives a match in seconds.
What is the hardness of Sapphire?
Sapphire has a Mohs hardness of 9. It scratches glass, steel and even quartz; only harder gems will mark it.
What is the difference between Sapphire and Spinel?
Sapphire (Mohs 9, adamantine luster) and Spinel (Mohs 8, vitreous luster) look alike, but hardness, streak and heft usually separate them. See the full Sapphire vs Spinel comparison for a side-by-side table.
How do I know if my Sapphire is real?
Real Sapphire 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 Sapphire worth anything?
Entry-level Sapphire specimens sell for around $500, typical collector pieces about $5000, and premium examples $50000 or more depending on size, quality and locality.
What color is Sapphire?
Sapphire is most often blue, pink, yellow, and orange. Color varies with impurities and locality, so confirm with hardness and luster rather than color alone.
