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

Spinel (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

Red, Yellow, Brown, Light To Dark Green, Grayish Green, Yellowish Green, Pale Pink To Pink, Light To Dark Blue, Greenish Blue, Violet, Mauve, Orange, Colorless

  • Spinel-synthetic-flame-fusion classification

    CommonName
    Spinel (Synthetic - Flame Fusion)
    Species
    Spinel
    Variety
    Flame-Fusion Synthetic Spinel
    Colors
    Red, Yellow, Brown, Light To Dark Green, Grayish Green, Yellowish Green, Pale Pink To Pink, Light To Dark Blue, Greenish Blue, Violet, Mauve, Orange, Colorless
    AlternateNames
    Flame-Fusion Synthetic Spinel, Alumag, Corundolite, Lustergem, Magalux, Radient, Strongite ,Wesselton, Simulated Diamond, Aquagem, Rozircon, Berylite, Dirigem, Perigem, Emerada, Erinide
    GemstoneGroups
    KeySeparations
    refractive index, SR nature commonly with ADR cross hatch effect, magnification, color filter and spectrum and possible fluorescence. An accurate RI reading can distinguish natural from synthetic spinel, which usually has a higher RI.
    ClassificationComments
    Colorless variety trade names: Alumag, Corundolite, Lustergem, Magalux, Radient, Simulated Diamond, Strongite ,WesseltonColored variety trade names: Aquagem, Berylite, Dirigem, Emerada, Erinide, Perigem, RozirconMisnomers: synthetic aquamarine, synthetic peridot, synthetic birthstone varieties, Jourado Diamond, Brazilian Emerald, Hope Sapphire. Red stones: RI 1.722 (+/-0.003) and SG 3.59 (+/-0.001)Pink, blue, violet, colorless and green stones: RI 1.728 (+0.012/-0.008) and SG 3.64 (+0.02/-0.12)
  • Spinel-synthetic-flame-fusion chemistry & crystallography

    ChemicalName
    magnesium aluminum oxide
    ChemicalFormula
    MgAl2O4
    Synthesis
    flame fusion
    CrystalSystem
    Cubic
    ChemistryClassification
    Oxide
    Nature
    Synthetic
    Crystallinity
    Crystalline
    ChemistryComments
  • Spinel-synthetic-flame-fusion optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    Strength: weak fire Value: 0.02
    OpticalComments
    RefractiveIndex
    1.722-1.728
    Tolerance:-1.5
    Birefringence
    0-0
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Singly Refractive (SR) With ADR
    Fluorescence
    SWUV: Variable
    LWUV: Variable
    CCFReaction
    synthetic blue spinel produes a strong red reaction
    Pleochroism
    None
  • Spinel-synthetic-flame-fusion characteristic physical properties

    Hardness
    8
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.57-3.7 Range:0.1/-0.03 Typical:3.6
    Toughness
    Varies
    Inclusions
    Flame-fusion spinel may contain thread like or angular gas bubbles. Red stones might show curved striae growth patterns or color banding but this is rare. Strongly saturated blue stones might show red flashes due to cobalt as coloring agent.
    Luster
    SubAdamantine
    Stability
    Very Good
    Fracture
    Conchoidal
    Cleavage
    None