Sapphire (Synthetic - Hydrothermal) Gemstone & Information | Gemopedia by JTV | Gemopedia™

Sapphire (Synthetic - Hydrothermal)

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.

Colors

Violet Blue, Greenish Blue, Blue

  • Sapphire-synthetic-hydrothermal classification

    CommonName
    Sapphire (Synthetic - Hydrothermal)
    Species
    Corundum
    Variety
    Hydrothermal Synthetic Sapphire
    Colors
    Violet Blue, Greenish Blue, Blue
    AlternateNames
    Lab Created Sapphire
    GemstoneGroups
    KeySeparations
    magnification, RI, pleochroism and maybe spectrum
    ClassificationComments
    Stones are colored by nickel and chromium and will have different pleochroism than natural stones.
  • Sapphire-synthetic-hydrothermal chemistry & crystallography

    ChemicalName
    aluminum oxide
    ChemicalFormula
    Al2O3
    Synthesis
    hydrothermal
    CrystalSystem
    Trigonal
    ChemistryClassification
    Oxide
    Nature
    Synthetic
    Crystallinity
    Crystalline
    ChemistryComments
  • Sapphire-synthetic-hydrothermal optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    Strength: moderate fire Value: 0.018
    OpticalComments
    RefractiveIndex
    1.762-1.77
    Tolerance:(+0.009/-0.005)
    Birefringence
    0.008-0.01
    OpticCharacter
    Uniaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    If colored by chromium bright red
    Pleochroism
    Dichroic, moderate to strong, varying shades of body color
  • Sapphire-synthetic-hydrothermal characteristic physical properties

    Hardness
    9
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.95-4.1 Typical:4
    Toughness
    Excellent
    Inclusions
    Look 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.
    Luster
    SubAdamantine
    Stability
    Very Good
    Fracture
    Conchoidal
    Cleavage
    None