Sapphire (Synthetic - Hydrothermal) Gemstone & Information | Gemopedia by JTV | Gemopedia™
Hydrothermally grown synthetic sapphires crystallize slowly out of a solution (a mix of water and dissolved elements) that has been exposed to heat and pressure similar to the conditions on Earth under which the natural gem mineral grows. Synthetic gems have the same chemical, optical, and physical properties of their natural counterparts, but are a more cost-effective alternative to a natural gem.
Violet Blue, Greenish Blue, Blue
Sapphire-synthetic-hydrothermal classificationCommonNameSapphire (Synthetic - Hydrothermal)SpeciesCorundumVarietyHydrothermal Synthetic SapphireColorsViolet Blue, Greenish Blue, BlueAlternateNamesLab Created SapphireGemstoneGroupsKeySeparationsmagnification, RI, pleochroism and maybe spectrumClassificationCommentsStones are colored by nickel and chromium and will have different pleochroism than natural stones.
Sapphire-synthetic-hydrothermal chemistry & crystallographyChemicalNamealuminum oxideChemicalFormulaAl2O3SynthesishydrothermalCrystalSystemTrigonalChemistryClassificationOxideNatureSyntheticCrystallinityCrystallineChemistryComments
Sapphire-synthetic-hydrothermal optical propertiesTransparencyTransparent - OpaqueDispersionStrength: moderate fire Value: 0.018OpticalCommentsRefractiveIndex1.762-1.77
Tolerance:(+0.009/-0.005)Birefringence0.008-0.01OpticCharacterUniaxialOpticSignNegativePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: Inert
LWUV: InertCCFReactionIf colored by chromium bright redPleochroismDichroic, moderate to strong, varying shades of body color
Sapphire-synthetic-hydrothermal characteristic physical propertiesHardness9CharacteristicCommentsStreakWhiteSpecificGravity3.95-4.1 Typical:4ToughnessExcellentInclusionsLook for chevron, wavy, zig-zag or mosaic growth patterns in hydrothermal synthetic ruby because stones might show growth zoning similar to natural ruby. Fingerprint like inclusions with 2-phase and 3-phase inclusions can be seen in stones. Sometimes flake like copper inclusions are visible in reflected light.LusterSubAdamantineStabilityVery GoodFractureConchoidalCleavageNone