Sapphire is the gem-quality variety of corundum, excluding the red variety known as ruby. It is prized for its extreme hardness and rich color saturation, commonly occurring in blue, though it appears in a spectrum of other hues. Collectors look for strong pleochroism and high clarity, with the most valuable stones often originating from metamorphic deposits.
Is this sapphire?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch sapphire with a known reference. Sapphire sits at Mohs 9 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Sapphire leaves a none streak.
- 3Read the lusterHold the specimen under a strong light. Sapphire typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: blue, yellow, pink, green, white, purple, orange.
- 5Look at form & habitCrystal system: trigonal. Typical habit: hexagonal bipyramidal crystals.
Often confused with
Sapphire vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Sapphire is noticeably harder (Mohs 9 vs. 8); streak differs — Sapphire leaves none, Spinel leaves white.
How to tell apart: Sapphire is noticeably harder (Mohs 9 vs. 6-6.5); streak differs — Sapphire leaves none, Benitoite leaves white.
How to tell apart: Sapphire is noticeably harder (Mohs 9 vs. 4.5-7); streak differs — Sapphire leaves none, Kyanite leaves white.
Often found alongside sapphire
Minerals reported to co-occur with sapphire. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Al₂O₃
- Mohs hardness
- 9
- Density
- 3.98-4.10 g/cm³
- Streak
- None
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Trigonal
- Crystal habit
- Hexagonal Bipyramidal Crystals
- Cleavage
- None
- Rarity
- Common
- Uses
- Gemstone, Jewelry, Collector
- Host rock
- Pegmatites, Basalts, And Metamorphic Rocks Like Marble
- Typical price
- $50-500 per carat for commercial grade, $1000-10,000+ per carat for investment grade
Where rockhounds find sapphire
36 mapped spotsClassic worldwide localities
- Sri Lanka
- Myanmar
- Madagascar
- Kashmir
- Australia
- United States
U.S. states with sapphire
Each link opens a state-specific list of mapped rockhounding spots that produce sapphire.
Field-hunting tip
Look in pegmatites, basalts, and metamorphic rocks like marble country — that is the host setting where sapphire typically forms. If you start seeing feldspar, garnet, zircon in float, you are in the right ground. Field specimens usually show a hexagonal bipyramidal crystals habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in North Carolina, Montana, Idaho — start trip planning there.
Common questions
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Find sapphire on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
