White sapphire is the colorless variety of corundum, prized for its excellent hardness and brilliance. Collectors look for high clarity and minimal inclusions in these stones, which are often used as natural alternatives to diamonds in jewelry settings.
Is this white 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 white sapphire with a known reference. White 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. White Sapphire leaves a none streak.
- 3Read the lusterHold the specimen under a strong light. White Sapphire typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: white, colorless.
- 5Look at form & habitCrystal system: trigonal. Typical habit: tabular, prismatic crystals.
Often confused with
White Sapphire vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: White Sapphire is noticeably harder (Mohs 9 vs. 7); streak differs — White Sapphire leaves none, Quartz leaves white.
How to tell apart: White Sapphire is noticeably harder (Mohs 9 vs. 8); streak differs — White Sapphire leaves none, Topaz leaves white.
How to tell apart: White Sapphire is noticeably harder (Mohs 9 vs. 7.5); streak differs — White Sapphire leaves none, Zircon leaves white; luster reads vitreous on White Sapphire and adamantine on Zircon.
Often found alongside white sapphire
Minerals reported to co-occur with white 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
- 3.98-4.1 g/cm³
- Streak
- None
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Trigonal
- Crystal habit
- Tabular, Prismatic Crystals
- Cleavage
- None
- Rarity
- Common
- Uses
- Gemstone, Jewelry
- Host rock
- Pegmatites, Metamorphic Marble, Alluvial Deposits
- Typical price
- $20-200 per carat depending on clarity and cut
Where rockhounds find white sapphire
Classic worldwide localities
- Sri Lanka
- Madagascar
- Tanzania
- Myanmar
Field-hunting tip
Look in pegmatites, metamorphic marble, alluvial deposits country — that is the host setting where white sapphire typically forms. If you start seeing spinels, garnets, zircon in float, you are in the right ground. Field specimens usually show a tabular, prismatic crystals habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find white sapphire on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
