Sapphire
E583692
Sapphire is a precious gemstone variety of the mineral corundum, typically blue, valued for its hardness, brilliance, and use in fine jewelry and industrial applications.
Observed surface forms (1)
| Surface form | Occurrences |
|---|---|
| SAPPHIRE | 1 |
Statements (80)
| Predicate | Object |
|---|---|
| instanceOf |
gemstone
ⓘ
mineral variety ⓘ variety of corundum ⓘ |
| belongsToMineralGroup | corundum ⓘ |
| canBeSynthetic | true ⓘ |
| canHaveColor |
black
ⓘ
colorless ⓘ green ⓘ orange ⓘ pink ⓘ purple ⓘ yellow ⓘ |
| colorIsCausedByImpurities | true ⓘ |
| commonColoringImpurity |
chromium
ⓘ
iron ⓘ magnesium ⓘ titanium ⓘ vanadium ⓘ |
| differsFromRubyBy | color definition within corundum group ⓘ |
| hasBlueColorDueTo | iron and titanium impurities ⓘ |
| hasBlueComplementaryGem | ruby (red corundum) NERFINISHED ⓘ |
| hasChemicalFormula | Al2O3 ⓘ |
| hasCleavage | none ⓘ |
| hasCrystalSystem |
hexagonal (trigonal subdivision)
ⓘ
trigonal ⓘ |
| hasFracture | conchoidal to uneven ⓘ |
| hasLuster | vitreous ⓘ |
| hasMineralClass | oxide mineral ⓘ |
| hasMohsHardness | 9 ⓘ |
| hasNotableVariety |
Kashmir sapphire
NERFINISHED
ⓘ
Padparadscha sapphire NERFINISHED ⓘ star sapphire ⓘ |
| hasOpticalUse |
UV optics
ⓘ
infrared optics ⓘ |
| hasPhenomenon |
asterism in star sapphires
ⓘ
color change in some sapphires ⓘ |
| hasRefractiveIndexRange | 1.76–1.77 ⓘ |
| hasSpecificGravityRange | 3.95–4.03 ⓘ |
| hasSymbolism |
loyalty
ⓘ
nobility ⓘ wisdom ⓘ |
| hasTenacity | tough ⓘ |
| hasTransparencyRange | transparent to opaque ⓘ |
| hasTypicalColor | blue ⓘ |
| isAllochromatic | true ⓘ |
| isAssociatedWithAnniversary |
45th wedding anniversary
ⓘ
65th wedding anniversary ⓘ |
| isBirthstoneFor | September ⓘ |
| isColorlessWhenPure | true ⓘ |
| isConsideredPreciousGemstone | true ⓘ |
| isHeatTreated | commonly to improve color and clarity ⓘ |
| isMinedIn |
Australia
NERFINISHED
ⓘ
Kashmir NERFINISHED ⓘ Madagascar NERFINISHED ⓘ Montana, United States NERFINISHED ⓘ Myanmar NERFINISHED ⓘ Sri Lanka NERFINISHED ⓘ Thailand NERFINISHED ⓘ |
| isPleochroic | true ⓘ |
| isSecondOnlyInHardnessTo | diamond ⓘ |
| isUsedIn |
LED substrates
ⓘ
bracelets ⓘ earrings ⓘ engagement rings ⓘ fine jewelry ⓘ industrial applications ⓘ necklaces ⓘ optical components ⓘ scientific instruments ⓘ scratch-resistant windows ⓘ semiconductor substrates ⓘ watch crystals ⓘ watches ⓘ |
| isValuedFor |
brilliance
ⓘ
color ⓘ hardness ⓘ |
| syntheticProductionMethod |
Czochralski process
NERFINISHED
ⓘ
Verneuil process NERFINISHED ⓘ flux growth ⓘ hydrothermal growth ⓘ |
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.