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

Sapphire (Synthetic Color-change)

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

Reddish Purple, Purple Incandescent Light, Grayish Blue In Daylight, Florescent Light

  • Sapphire-synthetic-color-change classification

    CommonName
    Sapphire (Synthetic Color-change)
    Species
    Corundum
    Variety
    Synthetic Color-Change Sapphire
    Colors
    Reddish Purple, Purple Incandescent Light, Grayish Blue In Daylight, Florescent Light
    AlternateNames
    Lab Created Color-Change Sapphire
    GemstoneGroups
    KeySeparations
    color change, RI birefringence, magnification and spectrum. Will have a different spectrum than natural stones.
    ClassificationComments
  • Sapphire-synthetic-color-change chemistry & crystallography

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

    Transparency
    Transparent - Semitranslucent
    Dispersion
    Strength: weak fire Value: 0.018
    OpticalComments
    RefractiveIndex
    1.762-1.779
    Tolerance:(+0.009/-0.005)
    Birefringence
    0.008-0.01
    OpticCharacter
    Uniaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: moderate orange to red or blue
    LWUV: moderate orange to red
    CCFReaction
    Pleochroism
    Dichroic, moderate violet to pinkish brown
  • Sapphire-synthetic-color-change characteristic physical properties

    Hardness
    9
    CharacteristicComments
    Streak
    White
    SpecificGravity
    4.1-3.95 Typical:4
    Toughness
    Excellent
    Inclusions
    Flame fusion color-change sapphire might have bubbles and curved striae.
    Luster
    SubAdamantine
    Stability
    Very Good
    Fracture
    Conchoidal
    Cleavage
    None