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

Sapphire (Synthetic - Flame Fusion)

The flame fusion process for creating gems, also called the Verneuil process, is the most affordable and common synthesis method for producing corundum (ruby and sapphire) and spinel. Powdered chemicals (the building blocks of the gem) are dropped through a high-temperature flame. The molten powder repeatedly falls from the flame onto a rotating pedestal, creating a synthetic crystal, called a boule, which can later be faceted into a gemstone. 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

Light Violet-Blue, Blue, Strongly Green-Blue

  • Sapphire-synthetic-flame-fusion classification

    CommonName
    Sapphire (Synthetic - Flame Fusion)
    Species
    Corundum
    Variety
    Flame-Fusion Synthetic Sapphire
    Colors
    Light Violet-Blue, Blue, Strongly Green-Blue
    AlternateNames
    Lab Created Sapphire
    GemstoneGroups
    KeySeparations
    refractive index, birefringence, pleochroism, magnification with immersion and spectrum
    ClassificationComments
    Stones might show polishing marks and poor polish. The stones will tend to be cut in calibrated sizes and with be symmetrical.
  • Sapphire-synthetic-flame-fusion chemistry & crystallography

    ChemicalName
    aluminum oxide
    ChemicalFormula
    Al2O3
    Synthesis
    flame fusion
    CrystalSystem
    Trigonal
    ChemistryClassification
    Carbonate
    Nature
    Synthetic
    Crystallinity
    Crystalline
    ChemistryComments
  • Sapphire-synthetic-flame-fusion 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: weak to moderate chalky blue to blue-green to yellowish green
    LWUV: inert
    CCFReaction
    Pleochroism
    Dichroic, moderate to strong, varying shades of body color
  • Sapphire-synthetic-flame-fusion characteristic physical properties

    Hardness
    9
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.95-4.1 Typical:4
    Toughness
    Excellent
    Inclusions
    Might show face up color zoning, curved striae that crosses facet junctions and strings of gas bubbles that might be mistaken for needles. It might be possible to see Plato lines or twinning planes under magnification and immersion with polarized light. Sometimes heated with borax to created fingerprint like inclusions to mask curved striae. Stones might show colorless areas and uneven color distribution.
    Luster
    SubAdamantine
    Stability
    Very Good
    Fracture
    Conchoidal
    Cleavage
    None